text: /*
   * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  #include "web/WebViewImpl.h"
  
  #include "core/CSSValueKeywords.h"
  #include "core/HTMLNames.h"
  #include "core/InputTypeNames.h"
  #include "core/clipboard/DataObject.h"
  #include "core/dom/Document.h"
  #include "core/dom/DocumentMarkerController.h"
  #include "core/dom/Fullscreen.h"
  #include "core/dom/NodeRenderingTraversal.h"
  #include "core/dom/Text.h"
  #include "core/editing/Editor.h"
  #include "core/editing/FrameSelection.h"
  #include "core/editing/HTMLInterchange.h"
  #include "core/editing/InputMethodController.h"
  #include "core/editing/TextIterator.h"
  #include "core/editing/markup.h"
  #include "core/events/KeyboardEvent.h"
  #include "core/events/WheelEvent.h"
  #include "core/frame/EventHandlerRegistry.h"
  #include "core/frame/FrameHost.h"
  #include "core/frame/FrameView.h"
  #include "core/frame/LocalFrame.h"
  #include "core/frame/PinchViewport.h"
  #include "core/frame/RemoteFrame.h"
  #include "core/frame/Settings.h"
  #include "core/frame/SmartClip.h"
  #include "core/html/HTMLInputElement.h"
  #include "core/html/HTMLMediaElement.h"
  #include "core/html/HTMLPlugInElement.h"
  #include "core/html/HTMLTextAreaElement.h"
  #include "core/html/canvas/WebGLRenderingContext.h"
  #include "core/html/forms/PopupMenuClient.h"
  #include "core/html/ime/InputMethodContext.h"
  #include "core/inspector/InspectorController.h"
  #include "core/loader/DocumentLoader.h"
  #include "core/loader/FrameLoader.h"
  #include "core/loader/UniqueIdentifier.h"
  #include "core/page/Chrome.h"
  #include "core/page/ContextMenuController.h"
  #include "core/page/ContextMenuProvider.h"
  #include "core/page/DragController.h"
  #include "core/page/DragData.h"
  #include "core/page/DragSession.h"
  #include "core/page/EventHandler.h"
  #include "core/page/FocusController.h"
  #include "core/page/FrameTree.h"
  #include "core/page/InjectedStyleSheets.h"
  #include "core/page/Page.h"
  #include "core/page/PagePopupClient.h"
  #include "core/page/PointerLockController.h"
  #include "core/page/ScopedPageLoadDeferrer.h"
  #include "core/page/TouchDisambiguation.h"
  #include "core/rendering/RenderPart.h"
  #include "core/rendering/RenderView.h"
  #include "core/rendering/TextAutosizer.h"
  #include "core/rendering/compositing/RenderLayerCompositor.h"
  #include "modules/accessibility/AXObject.h"
  #include "modules/accessibility/AXObjectCacheImpl.h"
  #include "modules/credentialmanager/CredentialManagerClient.h"
  #include "modules/device_orientation/DeviceOrientationInspectorAgent.h"
  #include "modules/encryptedmedia/MediaKeysController.h"
  #include "modules/filesystem/InspectorFileSystemAgent.h"
  #include "modules/indexeddb/InspectorIndexedDBAgent.h"
  #include "platform/ContextMenu.h"
  #include "platform/ContextMenuItem.h"
  #include "platform/Cursor.h"
  #include "platform/KeyboardCodes.h"
  #include "platform/Logging.h"
  #include "platform/NotImplemented.h"
  #include "platform/PlatformGestureEvent.h"
  #include "platform/PlatformKeyboardEvent.h"
  #include "platform/PlatformMouseEvent.h"
  #include "platform/PlatformWheelEvent.h"
  #include "platform/RuntimeEnabledFeatures.h"
  #include "platform/TraceEvent.h"
  #include "platform/UserGestureIndicator.h"
  #include "platform/exported/WebActiveGestureAnimation.h"
  #include "platform/fonts/FontCache.h"
  #include "platform/graphics/Color.h"
  #include "platform/graphics/FirstPaintInvalidationTracking.h"
  #include "platform/graphics/Image.h"
  #include "platform/graphics/ImageBuffer.h"
  #include "platform/scroll/ScrollbarTheme.h"
  #include "platform/weborigin/SchemeRegistry.h"
  #include "public/platform/Platform.h"
  #include "public/platform/WebCompositeAndReadbackAsyncCallback.h"
  #include "public/platform/WebDragData.h"
  #include "public/platform/WebFloatPoint.h"
  #include "public/platform/WebGestureCurve.h"
  #include "public/platform/WebImage.h"
  #include "public/platform/WebLayerTreeView.h"
  #include "public/platform/WebURLRequest.h"
  #include "public/platform/WebVector.h"
  #include "public/web/WebAXObject.h"
  #include "public/web/WebActiveWheelFlingParameters.h"
  #include "public/web/WebAutofillClient.h"
  #include "public/web/WebBeginFrameArgs.h"
  #include "public/web/WebFrameClient.h"
  #include "public/web/WebHitTestResult.h"
  #include "public/web/WebInputElement.h"
  #include "public/web/WebMediaPlayerAction.h"
  #include "public/web/WebNode.h"
  #include "public/web/WebPlugin.h"
  #include "public/web/WebPluginAction.h"
  #include "public/web/WebRange.h"
  #include "public/web/WebTextInputInfo.h"
  #include "public/web/WebViewClient.h"
  #include "public/web/WebWindowFeatures.h"
  #include "web/CompositionUnderlineVectorBuilder.h"
  #include "web/ContextFeaturesClientImpl.h"
  #include "web/DatabaseClientImpl.h"
  #include "web/FullscreenController.h"
  #include "web/GraphicsLayerFactoryChromium.h"
  #include "web/LinkHighlight.h"
  #include "web/NavigatorContentUtilsClientImpl.h"
  #include "web/PopupContainer.h"
  #include "web/PrerendererClientImpl.h"
  #include "web/StorageQuotaClientImpl.h"
  #include "web/ValidationMessageClientImpl.h"
  #include "web/ViewportAnchor.h"
  #include "web/WebDevToolsAgentImpl.h"
  #include "web/WebDevToolsAgentPrivate.h"
  #include "web/WebInputEventConversion.h"
  #include "web/WebLocalFrameImpl.h"
  #include "web/WebPagePopupImpl.h"
  #include "web/WebPluginContainerImpl.h"
  #include "web/WebPopupMenuImpl.h"
  #include "web/WebRemoteFrameImpl.h"
  #include "web/WebSettingsImpl.h"
  #include "web/WorkerGlobalScopeProxyProviderImpl.h"
  #include "web/painting/ContinuousPainter.h"
  #include "wtf/CurrentTime.h"
  #include "wtf/RefPtr.h"
  #include "wtf/TemporaryChange.h"
  
  #if USE(DEFAULT_RENDER_THEME)
  #include "core/rendering/RenderThemeChromiumDefault.h"
  #endif
  
  // Get rid of WTF's pow define so we can use std::pow.
  #undef pow
  #include <cmath> // for std::pow
  
  // The following constants control parameters for automated scaling of webpages
  // (such as due to a double tap gesture or find in page etc.). These are
  // experimentally determined.
  static const int touchPointPadding = 32;
  static const int nonUserInitiatedPointPadding = 11;
  static const float minScaleDifference = 0.01f;
  static const float doubleTapZoomContentDefaultMargin = 5;
  static const float doubleTapZoomContentMinimumMargin = 2;
  static const double doubleTapZoomAnimationDurationInSeconds = 0.25;
  static const float doubleTapZoomAlreadyLegibleRatio = 1.2f;
  
  static const double multipleTargetsZoomAnimationDurationInSeconds = 0.25;
  static const double findInPageAnimationDurationInSeconds = 0;
  
  // Constants for viewport anchoring on resize.
  static const float viewportAnchorXCoord = 0.5f;
  static const float viewportAnchorYCoord = 0;
  
  // Constants for zooming in on a focused text field.
  static const double scrollAndScaleAnimationDurationInSeconds = 0.2;
  static const int minReadableCaretHeight = 16;
  static const int minReadableCaretHeightForTextArea = 13;
  static const float minScaleChangeToTriggerZoom = 1.5f;
  static const float leftBoxRatio = 0.3f;
  static const int caretPadding = 10;
  
  namespace blink {
  
  // Change the text zoom level by kTextSizeMultiplierRatio each time the user
  // zooms text in or out (ie., change by 20%).  The min and max values limit
  // text zoom to half and 3x the original text size.  These three values match
  // those in Apple's port in WebKit/WebKit/WebView/WebView.mm
  const double WebView::textSizeMultiplierRatio = 1.2;
  const double WebView::minTextSizeMultiplier = 0.5;
  const double WebView::maxTextSizeMultiplier = 3.0;
  
  // Used to defer all page activity in cases where the embedder wishes to run
  // a nested event loop. Using a stack enables nesting of message loop invocations.
  static WillBeHeapVector<RawPtrWillBeMember<ScopedPageLoadDeferrer>>& pageLoadDeferrerStack()
  {
      DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<WillBeHeapVector<RawPtrWillBeMember<ScopedPageLoadDeferrer>>>, deferrerStack, (adoptPtrWillBeNoop(new WillBeHeapVector<RawPtrWillBeMember<ScopedPageLoadDeferrer>>())));
      return *deferrerStack;
  }
  
  // Ensure that the WebDragOperation enum values stay in sync with the original
  // DragOperation constants.
  #define STATIC_ASSERT_MATCHING_ENUM(coreName) \
      static_assert(int(coreName) == int(Web##coreName), "DragOperation and WebDragOperation enum mismatch: " #coreName)
  STATIC_ASSERT_MATCHING_ENUM(DragOperationNone);
  STATIC_ASSERT_MATCHING_ENUM(DragOperationCopy);
  STATIC_ASSERT_MATCHING_ENUM(DragOperationLink);
  STATIC_ASSERT_MATCHING_ENUM(DragOperationGeneric);
  STATIC_ASSERT_MATCHING_ENUM(DragOperationPrivate);
  STATIC_ASSERT_MATCHING_ENUM(DragOperationMove);
  STATIC_ASSERT_MATCHING_ENUM(DragOperationDelete);
  STATIC_ASSERT_MATCHING_ENUM(DragOperationEvery);
  
  static bool shouldUseExternalPopupMenus = false;
  
  static int webInputEventKeyStateToPlatformEventKeyState(int webInputEventKeyState)
  {
      int platformEventKeyState = 0;
      if (webInputEventKeyState & WebInputEvent::ShiftKey)
          platformEventKeyState = platformEventKeyState | PlatformEvent::ShiftKey;
      if (webInputEventKeyState & WebInputEvent::ControlKey)
          platformEventKeyState = platformEventKeyState | PlatformEvent::CtrlKey;
      if (webInputEventKeyState & WebInputEvent::AltKey)
          platformEventKeyState = platformEventKeyState | PlatformEvent::AltKey;
      if (webInputEventKeyState & WebInputEvent::MetaKey)
          platformEventKeyState = platformEventKeyState | PlatformEvent::MetaKey;
      return platformEventKeyState;
  }
  
  namespace {
  
  class UserGestureNotifier {
  public:
      // If a UserGestureIndicator is created for a user gesture since the last
      // page load and *userGestureObserved is false, the UserGestureNotifier
      // will notify the client and set *userGestureObserved to true.
      UserGestureNotifier(WebAutofillClient*, bool* userGestureObserved);
      ~UserGestureNotifier();
  
  private:
      WebAutofillClient* const m_client;
      bool* const m_userGestureObserved;
  };
  
  UserGestureNotifier::UserGestureNotifier(WebAutofillClient* client, bool* userGestureObserved)
      : m_client(client)
      , m_userGestureObserved(userGestureObserved)
  {
      ASSERT(m_userGestureObserved);
  }
  
  UserGestureNotifier::~UserGestureNotifier()
  {
      if (!*m_userGestureObserved && UserGestureIndicator::processedUserGestureSinceLoad()) {
          *m_userGestureObserved = true;
          if (m_client)
              m_client->firstUserGestureObserved();
      }
  }
  
  } // namespace
  
  // WebView ----------------------------------------------------------------
  
  WebView* WebView::create(WebViewClient* client)
  {
      // Pass the WebViewImpl's self-reference to the caller.
      return WebViewImpl::create(client);
  }
  
  WebViewImpl* WebViewImpl::create(WebViewClient* client)
  {
      // Pass the WebViewImpl's self-reference to the caller.
      return adoptRef(new WebViewImpl(client)).leakRef();
  }
  
  void WebView::setUseExternalPopupMenus(bool useExternalPopupMenus)
  {
      shouldUseExternalPopupMenus = useExternalPopupMenus;
  }
  
  void WebView::updateVisitedLinkState(unsigned long long linkHash)
  {
      Page::visitedStateChanged(linkHash);
  }
  
  void WebView::resetVisitedLinkState()
  {
      Page::allVisitedStateChanged();
  }
  
  void WebView::willEnterModalLoop()
  {
      pageLoadDeferrerStack().append(new ScopedPageLoadDeferrer());
  }
  
  void WebView::didExitModalLoop()
  {
      ASSERT(pageLoadDeferrerStack().size());
  
      ScopedPageLoadDeferrer* deferrer = pageLoadDeferrerStack().last();
  #if ENABLE(OILPAN)
      deferrer->dispose();
  #else
      delete deferrer;
  #endif
      pageLoadDeferrerStack().removeLast();
  }
  
  void WebViewImpl::setMainFrame(WebFrame* frame)
  {
      if (frame->isWebLocalFrame())
          toWebLocalFrameImpl(frame)->initializeCoreFrame(&page()->frameHost(), 0, nullAtom, nullAtom);
      else
          toWebRemoteFrameImpl(frame)->initializeCoreFrame(&page()->frameHost(), 0, nullAtom);
  }
  
  void WebViewImpl::setCredentialManagerClient(WebCredentialManagerClient* webCredentialManagerClient)
  {
      ASSERT(m_page);
      provideCredentialManagerClientTo(*m_page, new CredentialManagerClient(webCredentialManagerClient));
  }
  
  void WebViewImpl::setDevToolsAgentClient(WebDevToolsAgentClient* devToolsClient)
  {
      if (devToolsClient)
          m_devToolsAgent = adoptPtr(new WebDevToolsAgentImpl(this, devToolsClient));
      else
          m_devToolsAgent.clear();
  }
  
  void WebViewImpl::setPrerendererClient(WebPrerendererClient* prerendererClient)
  {
      ASSERT(m_page);
      providePrerendererClientTo(*m_page, new PrerendererClientImpl(prerendererClient));
  }
  
  void WebViewImpl::setSpellCheckClient(WebSpellCheckClient* spellCheckClient)
  {
      m_spellCheckClient = spellCheckClient;
  }
  
  WebViewImpl::WebViewImpl(WebViewClient* client)
      : m_client(client)
      , m_spellCheckClient(0)
      , m_chromeClientImpl(this)
      , m_contextMenuClientImpl(this)
      , m_dragClientImpl(this)
      , m_editorClientImpl(this)
      , m_inspectorClientImpl(this)
      , m_spellCheckerClientImpl(this)
      , m_storageClientImpl(this)
      , m_shouldAutoResize(false)
      , m_zoomLevel(0)
      , m_minimumZoomLevel(zoomFactorToZoomLevel(minTextSizeMultiplier))
      , m_maximumZoomLevel(zoomFactorToZoomLevel(maxTextSizeMultiplier))
      , m_doubleTapZoomPageScaleFactor(0)
      , m_doubleTapZoomPending(false)
      , m_enableFakePageScaleAnimationForTesting(false)
      , m_fakePageScaleAnimationPageScaleFactor(0)
      , m_fakePageScaleAnimationUseAnchor(false)
      , m_contextMenuAllowed(false)
      , m_doingDragAndDrop(false)
      , m_ignoreInputEvents(false)
      , m_compositorDeviceScaleFactorOverride(0)
      , m_rootLayerScale(1)
      , m_suppressNextKeypressEvent(false)
      , m_imeAcceptEvents(true)
      , m_operationsAllowed(WebDragOperationNone)
      , m_dragOperation(WebDragOperationNone)
      , m_isTransparent(false)
      , m_tabsToLinks(false)
      , m_layerTreeView(0)
      , m_rootLayer(0)
      , m_rootGraphicsLayer(0)
      , m_rootTransformLayer(0)
      , m_graphicsLayerFactory(adoptPtr(new GraphicsLayerFactoryChromium(this)))
      , m_isAcceleratedCompositingActive(false)
      , m_layerTreeViewCommitsDeferred(false)
      , m_layerTreeViewClosed(false)
      , m_matchesHeuristicsForGpuRasterization(false)
      , m_recreatingGraphicsContext(false)
      , m_flingModifier(0)
      , m_flingSourceDevice(false)
      , m_fullscreenController(FullscreenController::create(this))
      , m_showFPSCounter(false)
      , m_showPaintRects(false)
      , m_showDebugBorders(false)
      , m_continuousPaintingEnabled(false)
      , m_showScrollBottleneckRects(false)
      , m_baseBackgroundColor(Color::white)
      , m_backgroundColorOverride(Color::transparent)
      , m_zoomFactorOverride(0)
      , m_userGestureObserved(false)
      , m_topControlsContentOffset(0)
      , m_topControlsLayoutHeight(0)
  {
      Page::PageClients pageClients;
      pageClients.chromeClient = &m_chromeClientImpl;
      pageClients.contextMenuClient = &m_contextMenuClientImpl;
      pageClients.editorClient = &m_editorClientImpl;
      pageClients.dragClient = &m_dragClientImpl;
      pageClients.inspectorClient = &m_inspectorClientImpl;
      pageClients.spellCheckerClient = &m_spellCheckerClientImpl;
      pageClients.storageClient = &m_storageClientImpl;
  
      m_page = adoptPtrWillBeNoop(new Page(pageClients));
      MediaKeysController::provideMediaKeysTo(*m_page, &m_mediaKeysClientImpl);
      provideNavigatorContentUtilsTo(*m_page, NavigatorContentUtilsClientImpl::create(this));
  
      provideContextFeaturesTo(*m_page, ContextFeaturesClientImpl::create());
      DeviceOrientationInspectorAgent::provideTo(*m_page);
  
      m_page->inspectorController().registerModuleAgent(InspectorFileSystemAgent::create(m_page.get()));
      provideDatabaseClientTo(*m_page, DatabaseClientImpl::create());
      InspectorIndexedDBAgent::provideTo(m_page.get());
      provideStorageQuotaClientTo(*m_page, StorageQuotaClientImpl::create());
      m_page->setValidationMessageClient(ValidationMessageClientImpl::create(*this));
      provideWorkerGlobalScopeProxyProviderTo(*m_page, WorkerGlobalScopeProxyProviderImpl::create());
  
      m_page->makeOrdinary();
  
      if (m_client) {
          setDeviceScaleFactor(m_client->screenInfo().deviceScaleFactor);
          setVisibilityState(m_client->visibilityState(), true);
      }
  
      initializeLayerTreeView();
  }
  
  WebViewImpl::~WebViewImpl()
  {
      ASSERT(!m_page);
  }
  
  WebLocalFrameImpl* WebViewImpl::mainFrameImpl()
  {
      return m_page && m_page->mainFrame() && m_page->mainFrame()->isLocalFrame() ? WebLocalFrameImpl::fromFrame(m_page->deprecatedLocalMainFrame()) : 0;
  }
  
  bool WebViewImpl::tabKeyCyclesThroughElements() const
  {
      ASSERT(m_page);
      return m_page->tabKeyCyclesThroughElements();
  }
  
  void WebViewImpl::setTabKeyCyclesThroughElements(bool value)
  {
      if (m_page)
          m_page->setTabKeyCyclesThroughElements(value);
  }
  
  void WebViewImpl::handleMouseLeave(LocalFrame& mainFrame, const WebMouseEvent& event)
  {
      m_client->setMouseOverURL(WebURL());
      PageWidgetEventHandler::handleMouseLeave(mainFrame, event);
  }
  
  void WebViewImpl::handleMouseDown(LocalFrame& mainFrame, const WebMouseEvent& event)
  {
      // If there is a popup open, close it as the user is clicking on the page (outside of the
      // popup). We also save it so we can prevent a click on an element from immediately
      // reopening the same popup.
      RefPtrWillBeRawPtr<PopupContainer> selectPopup = nullptr;
      RefPtr<WebPagePopupImpl> pagePopup;
      if (event.button == WebMouseEvent::ButtonLeft) {
          selectPopup = m_selectPopup;
          pagePopup = m_pagePopup;
          hidePopups();
          ASSERT(!m_selectPopup);
          ASSERT(!m_pagePopup);
      }
  
      m_lastMouseDownPoint = WebPoint(event.x, event.y);
  
      // Take capture on a mouse down on a plugin so we can send it mouse events.
      // If the hit node is a plugin but a scrollbar is over it don't start mouse
      // capture because it will interfere with the scrollbar receiving events.
      IntPoint point(event.x, event.y);
      if (event.button == WebMouseEvent::ButtonLeft && m_page->mainFrame()->isLocalFrame()) {
          point = m_page->deprecatedLocalMainFrame()->view()->windowToContents(point);
          HitTestResult result(m_page->deprecatedLocalMainFrame()->eventHandler().hitTestResultAtPoint(point));
          result.setToShadowHostIfInUserAgentShadowRoot();
          Node* hitNode = result.innerNonSharedNode();
  
          if (!result.scrollbar() && hitNode && hitNode->renderer() && hitNode->renderer()->isEmbeddedObject()) {
              m_mouseCaptureNode = hitNode;
              TRACE_EVENT_ASYNC_BEGIN0("input", "capturing mouse", this);
          }
      }
  
      PageWidgetEventHandler::handleMouseDown(mainFrame, event);
  
      if (event.button == WebMouseEvent::ButtonLeft && m_mouseCaptureNode)
          m_mouseCaptureGestureToken = mainFrame.eventHandler().takeLastMouseDownGestureToken();
  
      if (m_selectPopup && m_selectPopup == selectPopup) {
          // That click triggered a select popup which is the same as the one that
          // was showing before the click.  It means the user clicked the select
          // while the popup was showing, and as a result we first closed then
          // immediately reopened the select popup.  It needs to be closed.
          hideSelectPopup();
      }
  
      if (m_pagePopup && pagePopup && m_pagePopup->hasSamePopupClient(pagePopup.get())) {
          // That click triggered a page popup that is the same as the one we just closed.
          // It needs to be closed.
          closePagePopup(m_pagePopup.get());
      }
  
      // Dispatch the contextmenu event regardless of if the click was swallowed.
      if (!page()->settings().showContextMenuOnMouseUp()) {
  #if OS(MACOSX)
          if (event.button == WebMouseEvent::ButtonRight
              || (event.button == WebMouseEvent::ButtonLeft
                  && event.modifiers & WebMouseEvent::ControlKey))
              mouseContextMenu(event);
  #else
          if (event.button == WebMouseEvent::ButtonRight)
              mouseContextMenu(event);
  #endif
      }
  }
  
  void WebViewImpl::mouseContextMenu(const WebMouseEvent& event)
  {
      if (!mainFrameImpl() || !mainFrameImpl()->frameView())
          return;
  
      m_page->contextMenuController().clearContextMenu();
  
      PlatformMouseEventBuilder pme(mainFrameImpl()->frameView(), event);
  
      // Find the right target frame. See issue 1186900.
      HitTestResult result = hitTestResultForWindowPos(pme.position());
      Frame* targetFrame;
      if (result.innerNonSharedNode())
          targetFrame = result.innerNonSharedNode()->document().frame();
      else
          targetFrame = m_page->focusController().focusedOrMainFrame();
  
      if (!targetFrame->isLocalFrame())
          return;
  
      LocalFrame* targetLocalFrame = toLocalFrame(targetFrame);
  
  #if OS(WIN)
      targetLocalFrame->view()->setCursor(pointerCursor());
  #endif
  
      m_contextMenuAllowed = true;
      targetLocalFrame->eventHandler().sendContextMenuEvent(pme);
      m_contextMenuAllowed = false;
      // Actually showing the context menu is handled by the ContextMenuClient
      // implementation...
  }
  
  void WebViewImpl::handleMouseUp(LocalFrame& mainFrame, const WebMouseEvent& event)
  {
      PageWidgetEventHandler::handleMouseUp(mainFrame, event);
  
      if (page()->settings().showContextMenuOnMouseUp()) {
          // Dispatch the contextmenu event regardless of if the click was swallowed.
          // On Mac/Linux, we handle it on mouse down, not up.
          if (event.button == WebMouseEvent::ButtonRight)
              mouseContextMenu(event);
      }
  }
  
  bool WebViewImpl::handleMouseWheel(LocalFrame& mainFrame, const WebMouseWheelEvent& event)
  {
      hidePopups();
      return PageWidgetEventHandler::handleMouseWheel(mainFrame, event);
  }
  
  bool WebViewImpl::scrollBy(const WebFloatSize& delta, const WebFloatSize& velocity)
  {
      if (m_flingSourceDevice == WebGestureDeviceTouchpad) {
          WebMouseWheelEvent syntheticWheel;
          const float tickDivisor = WheelEvent::TickMultiplier;
  
          syntheticWheel.deltaX = delta.width;
          syntheticWheel.deltaY = delta.height;
          syntheticWheel.wheelTicksX = delta.width / tickDivisor;
          syntheticWheel.wheelTicksY = delta.height / tickDivisor;
          syntheticWheel.hasPreciseScrollingDeltas = true;
          syntheticWheel.x = m_positionOnFlingStart.x;
          syntheticWheel.y = m_positionOnFlingStart.y;
          syntheticWheel.globalX = m_globalPositionOnFlingStart.x;
          syntheticWheel.globalY = m_globalPositionOnFlingStart.y;
          syntheticWheel.modifiers = m_flingModifier;
  
          if (m_page && m_page->mainFrame() && m_page->mainFrame()->isLocalFrame() && m_page->deprecatedLocalMainFrame()->view())
              return handleMouseWheel(*m_page->deprecatedLocalMainFrame(), syntheticWheel);
      } else {
          WebGestureEvent syntheticGestureEvent;
  
          syntheticGestureEvent.type = WebInputEvent::GestureScrollUpdate;
          syntheticGestureEvent.data.scrollUpdate.preventPropagation = true;
          syntheticGestureEvent.data.scrollUpdate.deltaX = delta.width;
          syntheticGestureEvent.data.scrollUpdate.deltaY = delta.height;
          syntheticGestureEvent.x = m_positionOnFlingStart.x;
          syntheticGestureEvent.y = m_positionOnFlingStart.y;
          syntheticGestureEvent.globalX = m_globalPositionOnFlingStart.x;
          syntheticGestureEvent.globalY = m_globalPositionOnFlingStart.y;
          syntheticGestureEvent.modifiers = m_flingModifier;
          syntheticGestureEvent.sourceDevice = WebGestureDeviceTouchscreen;
  
          if (m_page && m_page->mainFrame() && m_page->mainFrame()->isLocalFrame() && m_page->deprecatedLocalMainFrame()->view())
              return handleGestureEvent(syntheticGestureEvent);
      }
      return false;
  }
  
  bool WebViewImpl::handleGestureEvent(const WebGestureEvent& event)
  {
      bool eventSwallowed = false;
      bool eventCancelled = false; // for disambiguation
  
      // Special handling for slow-path fling gestures.
      switch (event.type) {
      case WebInputEvent::GestureFlingStart: {
          if (mainFrameImpl()->frame()->eventHandler().isScrollbarHandlingGestures())
              break;
          m_client->cancelScheduledContentIntents();
          m_positionOnFlingStart = WebPoint(event.x / pageScaleFactor(), event.y / pageScaleFactor());
          m_globalPositionOnFlingStart = WebPoint(event.globalX, event.globalY);
          m_flingModifier = event.modifiers;
          m_flingSourceDevice = event.sourceDevice;
          OwnPtr<WebGestureCurve> flingCurve = adoptPtr(Platform::current()->createFlingAnimationCurve(event.sourceDevice, WebFloatPoint(event.data.flingStart.velocityX, event.data.flingStart.velocityY), WebSize()));
          ASSERT(flingCurve);
          m_gestureAnimation = WebActiveGestureAnimation::createAtAnimationStart(flingCurve.release(), this);
          scheduleAnimation();
          eventSwallowed = true;
  
          m_client->didHandleGestureEvent(event, eventCancelled);
          return eventSwallowed;
      }
      case WebInputEvent::GestureFlingCancel:
          if (endActiveFlingAnimation())
              eventSwallowed = true;
  
          m_client->didHandleGestureEvent(event, eventCancelled);
          return eventSwallowed;
      default:
          break;
      }
  
      PlatformGestureEventBuilder platformEvent(mainFrameImpl()->frameView(), event);
  
      // Special handling for double tap and scroll events as we don't want to
      // hit test for them.
      switch (event.type) {
      case WebInputEvent::GestureDoubleTap:
          if (m_webSettings->doubleTapToZoomEnabled() && minimumPageScaleFactor() != maximumPageScaleFactor()) {
              m_client->cancelScheduledContentIntents();
              animateDoubleTapZoom(platformEvent.position());
          }
          // GestureDoubleTap is currently only used by Android for zooming. For WebCore,
          // GestureTap with tap count = 2 is used instead. So we drop GestureDoubleTap here.
          eventSwallowed = true;
          m_client->didHandleGestureEvent(event, eventCancelled);
          return eventSwallowed;
      case WebInputEvent::GestureScrollBegin:
      case WebInputEvent::GesturePinchBegin:
          m_client->cancelScheduledContentIntents();
      case WebInputEvent::GestureScrollEnd:
      case WebInputEvent::GestureScrollUpdate:
      case WebInputEvent::GesturePinchEnd:
      case WebInputEvent::GesturePinchUpdate:
      case WebInputEvent::GestureFlingStart:
          // Scrolling-related gesture events invoke EventHandler recursively for each frame down
          // the chain, doing a single-frame hit-test per frame. This matches handleWheelEvent.
          // Perhaps we could simplify things by rewriting scroll handling to work inner frame
          // out, and then unify with other gesture events.
          eventSwallowed = mainFrameImpl()->frame()->eventHandler().handleGestureScrollEvent(platformEvent);
          m_client->didHandleGestureEvent(event, eventCancelled);
          return eventSwallowed;
      default:
          break;
      }
  
      // Hit test across all frames and do touch adjustment as necessary for the event type.
      GestureEventWithHitTestResults targetedEvent =
          m_page->deprecatedLocalMainFrame()->eventHandler().targetGestureEvent(platformEvent);
  
      // Handle link highlighting outside the main switch to avoid getting lost in the
      // complicated set of cases handled below.
      switch (event.type) {
      case WebInputEvent::GestureShowPress:
          // Queue a highlight animation, then hand off to regular handler.
          enableTapHighlightAtPoint(targetedEvent);
          break;
      case WebInputEvent::GestureTapCancel:
      case WebInputEvent::GestureTap:
      case WebInputEvent::GestureLongPress:
          for (size_t i = 0; i < m_linkHighlights.size(); ++i)
              m_linkHighlights[i]->startHighlightAnimationIfNeeded();
          break;
      default:
          break;
      }
  
      switch (event.type) {
      case WebInputEvent::GestureTap: {
          m_client->cancelScheduledContentIntents();
          if (detectContentOnTouch(targetedEvent)) {
              eventSwallowed = true;
              break;
          }
  
          RefPtrWillBeRawPtr<PopupContainer> selectPopup = nullptr;
          selectPopup = m_selectPopup;
          hideSelectPopup();
          ASSERT(!m_selectPopup);
  
          // Don't trigger a disambiguation popup on sites designed for mobile devices.
          // Instead, assume that the page has been designed with big enough buttons and links.
          // Don't trigger a disambiguation popup when screencasting, since it's implemented outside of
          // compositor pipeline and is not being screencasted itself. This leads to bad user experience.
          if (event.data.tap.width > 0 && !shouldDisableDesktopWorkarounds() && !page()->inspectorController().screencastEnabled()) {
              WebGestureEvent scaledEvent = event;
              scaledEvent.x = event.x / pageScaleFactor();
              scaledEvent.y = event.y / pageScaleFactor();
              scaledEvent.data.tap.width = event.data.tap.width / pageScaleFactor();
              scaledEvent.data.tap.height = event.data.tap.height / pageScaleFactor();
              IntRect boundingBox(
                  scaledEvent.x - scaledEvent.data.tap.width / 2,
                  scaledEvent.y - scaledEvent.data.tap.height / 2,
                  scaledEvent.data.tap.width,
                  scaledEvent.data.tap.height);
  
              WebSize pinchViewportOffset = pinchVirtualViewportEnabled() ?
                  flooredIntSize(page()->frameHost().pinchViewport().location()) : IntSize();
  
              // Keep bounding box relative to the main frame.
              boundingBox.move(pinchViewportOffset);
  
              Vector<IntRect> goodTargets;
              WillBeHeapVector<RawPtrWillBeMember<Node>> highlightNodes;
              findGoodTouchTargets(boundingBox, mainFrameImpl()->frame(), goodTargets, highlightNodes);
              // FIXME: replace touch adjustment code when numberOfGoodTargets == 1?
              // Single candidate case is currently handled by: https://bugs.webkit.org/show_bug.cgi?id=85101
              if (goodTargets.size() >= 2 && m_client
                  && m_client->didTapMultipleTargets(pinchViewportOffset, boundingBox, goodTargets)) {
  
                  enableTapHighlights(highlightNodes);
                  for (size_t i = 0; i < m_linkHighlights.size(); ++i)
                      m_linkHighlights[i]->startHighlightAnimationIfNeeded();
                  eventSwallowed = true;
                  eventCancelled = true;
                  break;
              }
          }
  
          eventSwallowed = mainFrameImpl()->frame()->eventHandler().handleGestureEvent(targetedEvent);
  
          if (m_selectPopup && m_selectPopup == selectPopup) {
              // That tap triggered a select popup which is the same as the one that
              // was showing before the tap. It means the user tapped the select
              // while the popup was showing, and as a result we first closed then
              // immediately reopened the select popup. It needs to be closed.
              hideSelectPopup();
          }
  
          break;
      }
      case WebInputEvent::GestureTwoFingerTap:
      case WebInputEvent::GestureLongPress:
      case WebInputEvent::GestureLongTap: {
          if (!mainFrameImpl() || !mainFrameImpl()->frameView())
              break;
  
          m_client->cancelScheduledContentIntents();
          m_page->contextMenuController().clearContextMenu();
          m_contextMenuAllowed = true;
          eventSwallowed = mainFrameImpl()->frame()->eventHandler().handleGestureEvent(targetedEvent);
          m_contextMenuAllowed = false;
  
          break;
      }
      case WebInputEvent::GestureShowPress:
          m_client->cancelScheduledContentIntents();
      case WebInputEvent::GestureTapDown:
      case WebInputEvent::GestureTapCancel:
      case WebInputEvent::GestureTapUnconfirmed: {
          eventSwallowed = mainFrameImpl()->frame()->eventHandler().handleGestureEvent(targetedEvent);
          break;
      }
      default:
          ASSERT_NOT_REACHED();
      }
      m_client->didHandleGestureEvent(event, eventCancelled);
      return eventSwallowed;
  }
  
  void WebViewImpl::transferActiveWheelFlingAnimation(const WebActiveWheelFlingParameters& parameters)
  {
      TRACE_EVENT0("blink", "WebViewImpl::transferActiveWheelFlingAnimation");
      ASSERT(!m_gestureAnimation);
      m_positionOnFlingStart = parameters.point;
      m_globalPositionOnFlingStart = parameters.globalPoint;
      m_flingModifier = parameters.modifiers;
      OwnPtr<WebGestureCurve> curve = adoptPtr(Platform::current()->createFlingAnimationCurve(parameters.sourceDevice, WebFloatPoint(parameters.delta), parameters.cumulativeScroll));
      ASSERT(curve);
      m_gestureAnimation = WebActiveGestureAnimation::createWithTimeOffset(curve.release(), this, parameters.startTime);
      scheduleAnimation();
  }
  
  bool WebViewImpl::endActiveFlingAnimation()
  {
      if (m_gestureAnimation) {
          m_gestureAnimation.clear();
          if (m_layerTreeView)
              m_layerTreeView->didStopFlinging();
          return true;
      }
      return false;
  }
  
  bool WebViewImpl::startPageScaleAnimation(const IntPoint& targetPosition, bool useAnchor, float newScale, double durationInSeconds)
  {
      WebPoint clampedPoint = targetPosition;
      if (!useAnchor) {
          clampedPoint = clampOffsetAtScale(targetPosition, newScale);
          if (!durationInSeconds) {
              setPageScaleFactor(newScale, clampedPoint);
              return false;
          }
      }
      if (useAnchor && newScale == pageScaleFactor())
          return false;
  
      if (m_enableFakePageScaleAnimationForTesting) {
          m_fakePageScaleAnimationTargetPosition = targetPosition;
          m_fakePageScaleAnimationUseAnchor = useAnchor;
          m_fakePageScaleAnimationPageScaleFactor = newScale;
      } else {
          if (!m_layerTreeView)
              return false;
          m_layerTreeView->startPageScaleAnimation(targetPosition, useAnchor, newScale, durationInSeconds);
      }
      return true;
  }
  
  void WebViewImpl::enableFakePageScaleAnimationForTesting(bool enable)
  {
      m_enableFakePageScaleAnimationForTesting = enable;
  }
  
  void WebViewImpl::setShowFPSCounter(bool show)
  {
      if (m_layerTreeView) {
          TRACE_EVENT0("blink", "WebViewImpl::setShowFPSCounter");
          m_layerTreeView->setShowFPSCounter(show);
      }
      m_showFPSCounter = show;
  }
  
  void WebViewImpl::setShowPaintRects(bool show)
  {
      if (m_layerTreeView) {
          TRACE_EVENT0("blink", "WebViewImpl::setShowPaintRects");
          m_layerTreeView->setShowPaintRects(show);
      }
      m_showPaintRects = show;
      setFirstPaintInvalidationTrackingEnabledForShowPaintRects(show);
  }
  
  void WebViewImpl::setShowDebugBorders(bool show)
  {
      if (m_layerTreeView)
          m_layerTreeView->setShowDebugBorders(show);
      m_showDebugBorders = show;
  }
  
  void WebViewImpl::setContinuousPaintingEnabled(bool enabled)
  {
      if (m_layerTreeView) {
          TRACE_EVENT0("blink", "WebViewImpl::setContinuousPaintingEnabled");
          m_layerTreeView->setContinuousPaintingEnabled(enabled);
      }
      m_continuousPaintingEnabled = enabled;
      if (m_client)
          m_client->scheduleAnimation();
  }
  
  void WebViewImpl::setShowScrollBottleneckRects(bool show)
  {
      if (m_layerTreeView)
          m_layerTreeView->setShowScrollBottleneckRects(show);
      m_showScrollBottleneckRects = show;
  }
  
  void WebViewImpl::acceptLanguagesChanged()
  {
      if (!page())
          return;
  
      page()->acceptLanguagesChanged();
  }
  
  bool WebViewImpl::handleKeyEvent(const WebKeyboardEvent& event)
  {
      ASSERT((event.type == WebInputEvent::RawKeyDown)
          || (event.type == WebInputEvent::KeyDown)
          || (event.type == WebInputEvent::KeyUp));
  
      // Halt an in-progress fling on a key event.
      endActiveFlingAnimation();
  
      // Please refer to the comments explaining the m_suppressNextKeypressEvent
      // member.
      // The m_suppressNextKeypressEvent is set if the KeyDown is handled by
      // Webkit. A keyDown event is typically associated with a keyPress(char)
      // event and a keyUp event. We reset this flag here as this is a new keyDown
      // event.
      m_suppressNextKeypressEvent = false;
  
      // If there is a select popup, it should be the one processing the event,
      // not the page.
      if (m_selectPopup)
          return m_selectPopup->handleKeyEvent(PlatformKeyboardEventBuilder(event));
      if (m_pagePopup) {
          m_pagePopup->handleKeyEvent(PlatformKeyboardEventBuilder(event));
          // We need to ignore the next Char event after this otherwise pressing
          // enter when selecting an item in the popup will go to the page.
          if (WebInputEvent::RawKeyDown == event.type)
              m_suppressNextKeypressEvent = true;
          return true;
      }
  
      RefPtrWillBeRawPtr<Frame> focusedFrame = focusedCoreFrame();
      if (focusedFrame && focusedFrame->isRemoteFrame()) {
          WebRemoteFrameImpl* webFrame = WebRemoteFrameImpl::fromFrame(*toRemoteFrame(focusedFrame.get()));
          webFrame->client()->forwardInputEvent(&event);
          return true;
      }
  
      if (!focusedFrame || !focusedFrame->isLocalFrame())
          return false;
  
      LocalFrame* frame = toLocalFrame(focusedFrame.get());
  
      PlatformKeyboardEventBuilder evt(event);
  
      if (frame->eventHandler().keyEvent(evt)) {
          if (WebInputEvent::RawKeyDown == event.type) {
              // Suppress the next keypress event unless the focused node is a plug-in node.
              // (Flash needs these keypress events to handle non-US keyboards.)
              Element* element = focusedElement();
              if (!element || !element->renderer() || !element->renderer()->isEmbeddedObject())
                  m_suppressNextKeypressEvent = true;
          }
          return true;
      }
  
  #if !OS(MACOSX)
      const WebInputEvent::Type contextMenuTriggeringEventType =
  #if OS(WIN)
          WebInputEvent::KeyUp;
  #else
          WebInputEvent::RawKeyDown;
  #endif
  
      bool isUnmodifiedMenuKey = !(event.modifiers & WebInputEvent::InputModifiers) && event.windowsKeyCode == VKEY_APPS;
      bool isShiftF10 = event.modifiers == WebInputEvent::ShiftKey && event.windowsKeyCode == VKEY_F10;
      if ((isUnmodifiedMenuKey || isShiftF10) && event.type == contextMenuTriggeringEventType) {
          sendContextMenuEvent(event);
          return true;
      }
  #endif // !OS(MACOSX)
  
      return keyEventDefault(event);
  }
  
  bool WebViewImpl::handleCharEvent(const WebKeyboardEvent& event)
  {
      ASSERT(event.type == WebInputEvent::Char);
  
      // Please refer to the comments explaining the m_suppressNextKeypressEvent
      // member.  The m_suppressNextKeypressEvent is set if the KeyDown is
      // handled by Webkit. A keyDown event is typically associated with a
      // keyPress(char) event and a keyUp event. We reset this flag here as it
      // only applies to the current keyPress event.
      bool suppress = m_suppressNextKeypressEvent;
      m_suppressNextKeypressEvent = false;
  
      // If there is a select popup, it should be the one processing the event,
      // not the page.
      if (m_selectPopup)
          return m_selectPopup->handleKeyEvent(PlatformKeyboardEventBuilder(event));
      if (m_pagePopup)
          return m_pagePopup->handleKeyEvent(PlatformKeyboardEventBuilder(event));
  
      LocalFrame* frame = toLocalFrame(focusedCoreFrame());
      if (!frame)
          return suppress;
  
      EventHandler& handler = frame->eventHandler();
  
      PlatformKeyboardEventBuilder evt(event);
      if (!evt.isCharacterKey())
          return true;
  
      // Accesskeys are triggered by char events and can't be suppressed.
      if (handler.handleAccessKey(evt))
          return true;
  
      // Safari 3.1 does not pass off windows system key messages (WM_SYSCHAR) to
      // the eventHandler::keyEvent. We mimic this behavior on all platforms since
      // for now we are converting other platform's key events to windows key
      // events.
      if (evt.isSystemKey())
          return false;
  
      if (!suppress && !handler.keyEvent(evt))
          return keyEventDefault(event);
  
      return true;
  }
  
  WebRect WebViewImpl::computeBlockBounds(const WebRect& rect, bool ignoreClipping)
  {
      if (!mainFrameImpl())
          return WebRect();
  
      // Use the rect-based hit test to find the node.
      IntPoint point = mainFrameImpl()->frameView()->windowToContents(IntPoint(rect.x, rect.y));
      HitTestRequest::HitTestRequestType hitType = HitTestRequest::ReadOnly | HitTestRequest::Active | (ignoreClipping ? HitTestRequest::IgnoreClipping : 0);
      HitTestResult result = mainFrameImpl()->frame()->eventHandler().hitTestResultAtPoint(point, hitType, LayoutSize(rect.width, rect.height));
      result.setToShadowHostIfInUserAgentShadowRoot();
  
      Node* node = result.innerNonSharedNode();
      if (!node)
          return WebRect();
  
      // Find the block type node based on the hit node.
      // FIXME: This wants to walk composed tree with NodeRenderingTraversal::parent().
      while (node && (!node->renderer() || node->renderer()->isInline()))
          node = NodeRenderingTraversal::parent(*node);
  
      // Return the bounding box in the window coordinate system.
      if (node) {
          IntRect rect = node->Node::pixelSnappedBoundingBox();
          LocalFrame* frame = node->document().frame();
          return frame->view()->contentsToWindow(rect);
      }
      return WebRect();
  }
  
  WebRect WebViewImpl::widenRectWithinPageBounds(const WebRect& source, int targetMargin, int minimumMargin)
  {
      WebSize maxSize;
      if (mainFrame())
          maxSize = mainFrame()->contentsSize();
      IntSize scrollOffset;
      if (mainFrame())
          scrollOffset = mainFrame()->scrollOffset();
      int leftMargin = targetMargin;
      int rightMargin = targetMargin;
  
      const int absoluteSourceX = source.x + scrollOffset.width();
      if (leftMargin > absoluteSourceX) {
          leftMargin = absoluteSourceX;
          rightMargin = std::max(leftMargin, minimumMargin);
      }
  
      const int maximumRightMargin = maxSize.width - (source.width + absoluteSourceX);
      if (rightMargin > maximumRightMargin) {
          rightMargin = maximumRightMargin;
          leftMargin = std::min(leftMargin, std::max(rightMargin, minimumMargin));
      }
  
      const int newWidth = source.width + leftMargin + rightMargin;
      const int newX = source.x - leftMargin;
  
      ASSERT(newWidth >= 0);
      ASSERT(scrollOffset.width() + newX + newWidth <= maxSize.width);
  
      return WebRect(newX, source.y, newWidth, source.height);
  }
  
  float WebViewImpl::legibleScale() const
  {
      // Pages should be as legible as on desktop when at dpi scale, so no
      // need to zoom in further when automatically determining zoom level
      // (after double tap, find in page, etc), though the user should still
      // be allowed to manually pinch zoom in further if they desire.
      float legibleScale = 1;
      if (page())
          legibleScale *= page()->settings().accessibilityFontScaleFactor();
      return legibleScale;
  }
  
  void WebViewImpl::computeScaleAndScrollForBlockRect(const WebPoint& hitPoint, const WebRect& blockRect, float padding, float defaultScaleWhenAlreadyLegible, float& scale, WebPoint& scroll)
  {
      scale = pageScaleFactor();
      scroll.x = scroll.y = 0;
  
      WebRect rect = blockRect;
  
      if (!rect.isEmpty()) {
          float defaultMargin = doubleTapZoomContentDefaultMargin;
          float minimumMargin = doubleTapZoomContentMinimumMargin;
          // We want the margins to have the same physical size, which means we
          // need to express them in post-scale size. To do that we'd need to know
          // the scale we're scaling to, but that depends on the margins. Instead
          // we express them as a fraction of the target rectangle: this will be
          // correct if we end up fully zooming to it, and won't matter if we
          // don't.
          rect = widenRectWithinPageBounds(rect,
                  static_cast<int>(defaultMargin * rect.width / m_size.width),
                  static_cast<int>(minimumMargin * rect.width / m_size.width));
          // Fit block to screen, respecting limits.
          scale = static_cast<float>(m_size.width) / rect.width;
          scale = std::min(scale, legibleScale());
          if (pageScaleFactor() < defaultScaleWhenAlreadyLegible)
              scale = std::max(scale, defaultScaleWhenAlreadyLegible);
          scale = clampPageScaleFactorToLimits(scale);
      }
  
      // FIXME: If this is being called for auto zoom during find in page,
      // then if the user manually zooms in it'd be nice to preserve the
      // relative increase in zoom they caused (if they zoom out then it's ok
      // to zoom them back in again). This isn't compatible with our current
      // double-tap zoom strategy (fitting the containing block to the screen)
      // though.
  
      float screenWidth = m_size.width / scale;
      float screenHeight = m_size.height / scale;
  
      // Scroll to vertically align the block.
      if (rect.height < screenHeight) {
          // Vertically center short blocks.
          rect.y -= 0.5 * (screenHeight - rect.height);
      } else {
          // Ensure position we're zooming to (+ padding) isn't off the bottom of
          // the screen.
          rect.y = std::max<float>(rect.y, hitPoint.y + padding - screenHeight);
      } // Otherwise top align the block.
  
      // Do the same thing for horizontal alignment.
      if (rect.width < screenWidth)
          rect.x -= 0.5 * (screenWidth - rect.width);
      else
          rect.x = std::max<float>(rect.x, hitPoint.x + padding - screenWidth);
      scroll.x = rect.x;
      scroll.y = rect.y;
  
      scale = clampPageScaleFactorToLimits(scale);
      scroll = mainFrameImpl()->frameView()->windowToContents(scroll);
      scroll = clampOffsetAtScale(scroll, scale);
  }
  
  static Node* findCursorDefiningAncestor(Node* node, LocalFrame* frame)
  {
      // Go up the tree to find the node that defines a mouse cursor style
      while (node) {
          if (node->renderer()) {
              ECursor cursor = node->renderer()->style()->cursor();
              if (cursor != CURSOR_AUTO || frame->eventHandler().useHandCursor(node, node->isLink()))
                  break;
          }
          node = NodeRenderingTraversal::parent(*node);
      }
  
      return node;
  }
  
  static bool showsHandCursor(Node* node, LocalFrame* frame)
  {
      if (!node || !node->renderer())
          return false;
  
      ECursor cursor = node->renderer()->style()->cursor();
      return cursor == CURSOR_POINTER
          || (cursor == CURSOR_AUTO && frame->eventHandler().useHandCursor(node, node->isLink()));
  }
  
  Node* WebViewImpl::bestTapNode(const GestureEventWithHitTestResults& targetedTapEvent)
  {
      TRACE_EVENT0("input", "WebViewImpl::bestTapNode");
  
      if (!m_page || !m_page->mainFrame())
          return 0;
  
      Node* bestTouchNode = targetedTapEvent.hitTestResult().innerNode();
  
      // We might hit something like an image map that has no renderer on it
      // Walk up the tree until we have a node with an attached renderer
      // FIXME: This wants to walk composed tree with NodeRenderingTraversal::parent().
      while (bestTouchNode && !bestTouchNode->renderer())
          bestTouchNode = NodeRenderingTraversal::parent(*bestTouchNode);
  
      Node* cursorDefiningAncestor =
          findCursorDefiningAncestor(bestTouchNode, m_page->deprecatedLocalMainFrame());
      // We show a highlight on tap only when the current node shows a hand cursor
      if (!cursorDefiningAncestor || !showsHandCursor(cursorDefiningAncestor, m_page->deprecatedLocalMainFrame())) {
          return 0;
      }
  
      // We should pick the largest enclosing node with hand cursor set. We do this by first jumping
      // up to cursorDefiningAncestor (which is already known to have hand cursor set). Then we locate
      // the next cursor-defining ancestor up in the the tree and repeat the jumps as long as the node
      // has hand cursor set.
      do {
          bestTouchNode = cursorDefiningAncestor;
          cursorDefiningAncestor = findCursorDefiningAncestor(NodeRenderingTraversal::parent(*bestTouchNode),
              m_page->deprecatedLocalMainFrame());
      } while (cursorDefiningAncestor && showsHandCursor(cursorDefiningAncestor, m_page->deprecatedLocalMainFrame()));
  
      return bestTouchNode;
  }
  
  void WebViewImpl::enableTapHighlightAtPoint(const GestureEventWithHitTestResults& targetedTapEvent)
  {
      Node* touchNode = bestTapNode(targetedTapEvent);
  
      WillBeHeapVector<RawPtrWillBeMember<Node>> highlightNodes;
      highlightNodes.append(touchNode);
  
      enableTapHighlights(highlightNodes);
  }
  
  void WebViewImpl::enableTapHighlights(WillBeHeapVector<RawPtrWillBeMember<Node>>& highlightNodes)
  {
      if (highlightNodes.isEmpty())
          return;
  
      // Always clear any existing highlight when this is invoked, even if we
      // don't get a new target to highlight.
      m_linkHighlights.clear();
  
      // LinkHighlight reads out layout and compositing state, so we need to make sure that's all up to date.
      layout();
  
      for (size_t i = 0; i < highlightNodes.size(); ++i) {
          Node* node = highlightNodes[i];
  
          if (!node || !node->renderer())
              continue;
  
          Color highlightColor = node->renderer()->style()->tapHighlightColor();
          // Safari documentation for -webkit-tap-highlight-color says if the specified color has 0 alpha,
          // then tap highlighting is disabled.
          // http://developer.apple.com/library/safari/#documentation/appleapplications/reference/safaricssref/articles/standardcssproperties.html
          if (!highlightColor.alpha())
              continue;
  
          m_linkHighlights.append(LinkHighlight::create(node, this));
      }
  }
  
  void WebViewImpl::animateDoubleTapZoom(const IntPoint& point)
  {
      if (!mainFrameImpl())
          return;
  
      WebRect rect(point.x(), point.y(), touchPointPadding, touchPointPadding);
      WebRect blockBounds = computeBlockBounds(rect, false);
  
      float scale;
      WebPoint scroll;
  
      computeScaleAndScrollForBlockRect(point, blockBounds, touchPointPadding, minimumPageScaleFactor() * doubleTapZoomAlreadyLegibleRatio, scale, scroll);
  
      bool stillAtPreviousDoubleTapScale = (pageScaleFactor() == m_doubleTapZoomPageScaleFactor
          && m_doubleTapZoomPageScaleFactor != minimumPageScaleFactor())
          || m_doubleTapZoomPending;
  
      bool scaleUnchanged = fabs(pageScaleFactor() - scale) < minScaleDifference;
      bool shouldZoomOut = blockBounds.isEmpty() || scaleUnchanged || stillAtPreviousDoubleTapScale;
  
      bool isAnimating;
  
      if (shouldZoomOut) {
          scale = minimumPageScaleFactor();
          isAnimating = startPageScaleAnimation(mainFrameImpl()->frameView()->windowToContents(point), true, scale, doubleTapZoomAnimationDurationInSeconds);
      } else {
          isAnimating = startPageScaleAnimation(scroll, false, scale, doubleTapZoomAnimationDurationInSeconds);
      }
  
      if (isAnimating) {
          m_doubleTapZoomPageScaleFactor = scale;
          m_doubleTapZoomPending = true;
      }
  }
  
  void WebViewImpl::zoomToFindInPageRect(const WebRect& rect)
  {
      if (!mainFrameImpl())
          return;
  
      WebRect blockBounds = computeBlockBounds(rect, true);
  
      if (blockBounds.isEmpty()) {
          // Keep current scale (no need to scroll as x,y will normally already
          // be visible). FIXME: Revisit this if it isn't always true.
          return;
      }
  
      float scale;
      WebPoint scroll;
  
      computeScaleAndScrollForBlockRect(WebPoint(rect.x, rect.y), blockBounds, nonUserInitiatedPointPadding, minimumPageScaleFactor(), scale, scroll);
  
      startPageScaleAnimation(scroll, false, scale, findInPageAnimationDurationInSeconds);
  }
  
  bool WebViewImpl::zoomToMultipleTargetsRect(const WebRect& rect)
  {
      if (!mainFrameImpl())
          return false;
  
      float scale;
      WebPoint scroll;
  
      computeScaleAndScrollForBlockRect(WebPoint(rect.x, rect.y), rect, nonUserInitiatedPointPadding, minimumPageScaleFactor(), scale, scroll);
  
      if (scale <= pageScaleFactor())
          return false;
  
      startPageScaleAnimation(scroll, false, scale, multipleTargetsZoomAnimationDurationInSeconds);
      return true;
  }
  
  void WebViewImpl::hasTouchEventHandlers(bool hasTouchHandlers)
  {
      if (m_client)
          m_client->hasTouchEventHandlers(hasTouchHandlers);
  }
  
  bool WebViewImpl::hasTouchEventHandlersAt(const WebPoint& point)
  {
      // FIXME: Implement this. Note that the point must be divided by pageScaleFactor.
      return true;
  }
  
  #if !OS(MACOSX)
  // Mac has no way to open a context menu based on a keyboard event.
  bool WebViewImpl::sendContextMenuEvent(const WebKeyboardEvent& event)
  {
      // The contextMenuController() holds onto the last context menu that was
      // popped up on the page until a new one is created. We need to clear
      // this menu before propagating the event through the DOM so that we can
      // detect if we create a new menu for this event, since we won't create
      // a new menu if the DOM swallows the event and the defaultEventHandler does
      // not run.
      page()->contextMenuController().clearContextMenu();
  
      m_contextMenuAllowed = true;
      Frame* focusedFrame = page()->focusController().focusedOrMainFrame();
      if (!focusedFrame->isLocalFrame())
          return false;
      bool handled = toLocalFrame(focusedFrame)->eventHandler().sendContextMenuEventForKey();
      m_contextMenuAllowed = false;
      return handled;
  }
  #endif
  
  void WebViewImpl::showContextMenuAtPoint(float x, float y, PassRefPtrWillBeRawPtr<ContextMenuProvider> menuProvider)
  {
      if (!page()->mainFrame()->isLocalFrame())
          return;
      m_contextMenuAllowed = true;
      page()->contextMenuController().clearContextMenu();
      page()->contextMenuController().showContextMenuAtPoint(page()->deprecatedLocalMainFrame(), x, y, menuProvider);
      m_contextMenuAllowed = false;
  }
  
  bool WebViewImpl::keyEventDefault(const WebKeyboardEvent& event)
  {
      LocalFrame* frame = toLocalFrame(focusedCoreFrame());
      if (!frame)
          return false;
  
      switch (event.type) {
      case WebInputEvent::Char:
          if (event.windowsKeyCode == VKEY_SPACE) {
              int keyCode = ((event.modifiers & WebInputEvent::ShiftKey) ? VKEY_PRIOR : VKEY_NEXT);
              return scrollViewWithKeyboard(keyCode, event.modifiers);
          }
          break;
      case WebInputEvent::RawKeyDown:
          if (event.modifiers == WebInputEvent::ControlKey) {
              switch (event.windowsKeyCode) {
  #if !OS(MACOSX)
              case 'A':
                  focusedFrame()->executeCommand(WebString::fromUTF8("SelectAll"));
                  return true;
              case VKEY_INSERT:
              case 'C':
                  focusedFrame()->executeCommand(WebString::fromUTF8("Copy"));
                  return true;
  #endif
              // Match FF behavior in the sense that Ctrl+home/end are the only Ctrl
              // key combinations which affect scrolling. Safari is buggy in the
              // sense that it scrolls the page for all Ctrl+scrolling key
              // combinations. For e.g. Ctrl+pgup/pgdn/up/down, etc.
              case VKEY_HOME:
              case VKEY_END:
                  break;
              default:
                  return false;
              }
          }
          if (!event.isSystemKey && !(event.modifiers & WebInputEvent::ShiftKey))
              return scrollViewWithKeyboard(event.windowsKeyCode, event.modifiers);
          break;
      default:
          break;
      }
      return false;
  }
  
  bool WebViewImpl::scrollViewWithKeyboard(int keyCode, int modifiers)
  {
      ScrollDirection scrollDirection;
      ScrollGranularity scrollGranularity;
  #if OS(MACOSX)
      // Control-Up/Down should be PageUp/Down on Mac.
      if (modifiers & WebMouseEvent::ControlKey) {
        if (keyCode == VKEY_UP)
          keyCode = VKEY_PRIOR;
        else if (keyCode == VKEY_DOWN)
          keyCode = VKEY_NEXT;
      }
  #endif
      if (!mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity))
          return false;
  
      if (LocalFrame* frame = toLocalFrame(focusedCoreFrame()))
          return frame->eventHandler().bubblingScroll(scrollDirection, scrollGranularity);
      return false;
  }
  
  bool WebViewImpl::mapKeyCodeForScroll(
      int keyCode,
      ScrollDirection* scrollDirection,
      ScrollGranularity* scrollGranularity)
  {
      switch (keyCode) {
      case VKEY_LEFT:
          *scrollDirection = ScrollLeft;
          *scrollGranularity = ScrollByLine;
          break;
      case VKEY_RIGHT:
          *scrollDirection = ScrollRight;
          *scrollGranularity = ScrollByLine;
          break;
      case VKEY_UP:
          *scrollDirection = ScrollUp;
          *scrollGranularity = ScrollByLine;
          break;
      case VKEY_DOWN:
          *scrollDirection = ScrollDown;
          *scrollGranularity = ScrollByLine;
          break;
      case VKEY_HOME:
          *scrollDirection = ScrollUp;
          *scrollGranularity = ScrollByDocument;
          break;
      case VKEY_END:
          *scrollDirection = ScrollDown;
          *scrollGranularity = ScrollByDocument;
          break;
      case VKEY_PRIOR:  // page up
          *scrollDirection = ScrollUp;
          *scrollGranularity = ScrollByPage;
          break;
      case VKEY_NEXT:  // page down
          *scrollDirection = ScrollDown;
          *scrollGranularity = ScrollByPage;
          break;
      default:
          return false;
      }
  
      return true;
  }
  
  void WebViewImpl::hideSelectPopup()
  {
      if (m_selectPopup)
          m_selectPopup->hidePopup();
  }
  
  void WebViewImpl::popupOpened(PopupContainer* popupContainer)
  {
      ASSERT(!m_selectPopup);
      m_selectPopup = popupContainer;
      ASSERT(mainFrameImpl()->frame()->document());
      Document& document = *mainFrameImpl()->frame()->document();
      page()->frameHost().eventHandlerRegistry().didAddEventHandler(document, EventHandlerRegistry::WheelEvent);
  }
  
  void WebViewImpl::popupClosed(PopupContainer* popupContainer)
  {
      ASSERT(m_selectPopup);
      m_selectPopup = nullptr;
      ASSERT(mainFrameImpl()->frame()->document());
      Document& document = *mainFrameImpl()->frame()->document();
      // Remove the handler we added in |popupOpened| conditionally, because the
      // Document may have already removed it, for instance, due to a navigation.
      EventHandlerRegistry* registry = &document.frameHost()->eventHandlerRegistry();
      if (registry->eventHandlerTargets(EventHandlerRegistry::WheelEvent)->contains(&document))
          registry->didRemoveEventHandler(document, EventHandlerRegistry::WheelEvent);
  }
  
  PagePopup* WebViewImpl::openPagePopup(PagePopupClient* client, const IntRect& originBoundsInRootView)
  {
      ASSERT(client);
      if (hasOpenedPopup())
          hidePopups();
      ASSERT(!m_pagePopup);
  
      WebWidget* popupWidget = m_client->createPopupMenu(WebPopupTypePage);
      ASSERT(popupWidget);
      m_pagePopup = toWebPagePopupImpl(popupWidget);
      if (!m_pagePopup->initialize(this, client, originBoundsInRootView)) {
          m_pagePopup->closePopup();
          m_pagePopup = nullptr;
      }
      return m_pagePopup.get();
  }
  
  void WebViewImpl::closePagePopup(PagePopup* popup)
  {
      ASSERT(popup);
      WebPagePopupImpl* popupImpl = toWebPagePopupImpl(popup);
      ASSERT(m_pagePopup.get() == popupImpl);
      if (m_pagePopup.get() != popupImpl)
          return;
      m_pagePopup->closePopup();
      m_pagePopup = nullptr;
  }
  
  LocalDOMWindow* WebViewImpl::pagePopupWindow() const
  {
      return m_pagePopup ? m_pagePopup->window() : nullptr;
  }
  
  Frame* WebViewImpl::focusedCoreFrame() const
  {
      return m_page ? m_page->focusController().focusedOrMainFrame() : 0;
  }
  
  WebViewImpl* WebViewImpl::fromPage(Page* page)
  {
      if (!page)
          return 0;
      return static_cast<WebViewImpl*>(page->chrome().client().webView());
  }
  
  // WebWidget ------------------------------------------------------------------
  
  void WebViewImpl::close()
  {
      if (m_page) {
          // Initiate shutdown for the entire frameset.  This will cause a lot of
          // notifications to be sent.
          m_page->willBeDestroyed();
          m_page.clear();
      }
  
      // Should happen after m_page.clear().
      if (m_devToolsAgent)
          m_devToolsAgent.clear();
  
      // Reset the delegate to prevent notifications being sent as we're being
      // deleted.
      m_client = nullptr;
  
      deref();  // Balances ref() acquired in WebView::create
  }
  
  void WebViewImpl::willStartLiveResize()
  {
      if (mainFrameImpl() && mainFrameImpl()->frameView())
          mainFrameImpl()->frameView()->willStartLiveResize();
  
      LocalFrame* frame = mainFrameImpl()->frame();
      WebPluginContainerImpl* pluginContainer = WebLocalFrameImpl::pluginContainerFromFrame(frame);
      if (pluginContainer)
          pluginContainer->willStartLiveResize();
  }
  
  WebSize WebViewImpl::size()
  {
      return m_size;
  }
  
  void WebViewImpl::resizePinchViewport(const WebSize& newSize)
  {
      if (!pinchVirtualViewportEnabled())
          return;
  
      page()->frameHost().pinchViewport().setSize(newSize);
      page()->frameHost().pinchViewport().clampToBoundaries();
  }
  
  WebLocalFrameImpl* WebViewImpl::localFrameRootTemporary() const
  {
      // FIXME: This is a temporary method that finds the first localFrame in a traversal.
      // This is equivalent to mainFrame() if the mainFrame is in-process. We need to create
      // separate WebWidgets to be created by RenderParts, which are associated with *all*
      // local frame roots, not just the first one in the tree. Until then, this limits us
      // to having only one functioning connected LocalFrame subtree per process.
      for (Frame* frame = page()->mainFrame(); frame; frame = frame->tree().traverseNext()) {
          if (frame->isLocalRoot())
              return WebLocalFrameImpl::fromFrame(toLocalFrame(frame));
      }
      return 0;
  }
  
  void WebViewImpl::performResize()
  {
      m_pageScaleConstraintsSet.didChangeViewSize(m_size);
  
      updatePageDefinedViewportConstraints(localFrameRootTemporary()->frame()->document()->viewportDescription());
      updateMainFrameLayoutSize();
  
      // If the virtual viewport pinch mode is enabled, the main frame will be resized
      // after layout so it can be sized to the contentsSize.
      if (!pinchVirtualViewportEnabled() && localFrameRootTemporary()->frameView())
          localFrameRootTemporary()->frameView()->resize(m_size);
  
      if (pinchVirtualViewportEnabled())
          page()->frameHost().pinchViewport().setSize(m_size);
  
      // When device emulation is enabled, device size values may change - they are
      // usually set equal to the view size. These values are not considered viewport-dependent
      // (see MediaQueryExp::isViewportDependent), since they are only viewport-dependent in emulation mode,
      // and thus will not be invalidated in |FrameView::performPreLayoutTasks|.
      // Therefore we should force explicit media queries invalidation here.
      if (page()->inspectorController().deviceEmulationEnabled()) {
          if (Document* document = localFrameRootTemporary()->frame()->document()) {
              document->styleResolverChanged();
              document->mediaQueryAffectingValueChanged();
          }
      }
  }
  
  void WebViewImpl::setTopControlsContentOffset(float offset)
  {
      m_topControlsContentOffset = offset;
      m_layerTreeView->setTopControlsContentOffset(offset);
      didUpdateTopControls();
  }
  
  void WebViewImpl::setTopControlsLayoutHeight(float height)
  {
      m_topControlsLayoutHeight = height;
      didUpdateTopControls();
  }
  
  void WebViewImpl::didUpdateTopControls()
  {
      WebLocalFrameImpl* localFrameRoot = localFrameRootTemporary();
      if (!localFrameRoot)
          return;
  
      FrameView* view = localFrameRoot->frameView();
      if (!view)
          return;
  
      float topControlsViewportAdjustment = m_topControlsLayoutHeight - m_topControlsContentOffset;
      if (!pinchVirtualViewportEnabled()) {
          // The viewport bounds were adjusted on the compositor by this much due to top controls. Tell
          // the FrameView about it so it can make correct scroll offset clamping decisions during compositor
          // commits.
          view->setTopControlsViewportAdjustment(topControlsViewportAdjustment);
      } else {
          PinchViewport& pinchViewport = page()->frameHost().pinchViewport();
  
          if (pinchViewport.visibleRect().isEmpty())
              return;
  
          pinchViewport.setTopControlsAdjustment(topControlsViewportAdjustment);
  
  // On ChromeOS the pinch viewport can change size independent of the layout viewport due to the
  // on screen keyboard so we should only set the FrameView adjustment on Android.
  #if OS(ANDROID)
          // Shrink the FrameView by the amount that will maintain the aspect-ratio with the PinchViewport.
          float aspectRatio = pinchViewport.visibleRect().width() / pinchViewport.visibleRect().height();
          float newHeight = view->unscaledVisibleContentSize(ExcludeScrollbars).width() / aspectRatio;
          float adjustment = newHeight - view->unscaledVisibleContentSize(ExcludeScrollbars).height();
          view->setTopControlsViewportAdjustment(adjustment);
  #endif
      }
  }
  
  void WebViewImpl::resize(const WebSize& newSize)
  {
      if (m_shouldAutoResize || m_size == newSize)
          return;
  
      WebLocalFrameImpl* localFrameRoot = localFrameRootTemporary();
      if (!localFrameRoot)
          return;
  
      FrameView* view = localFrameRoot->frameView();
      if (!view)
          return;
  
      bool shouldAnchorAndRescaleViewport = settings()->mainFrameResizesAreOrientationChanges()
          && m_size.width && contentsSize().width() && newSize.width != m_size.width && !m_fullscreenController->isFullscreen();
      float oldPageScaleFactor = pageScaleFactor();
      float oldMinimumPageScaleFactor = minimumPageScaleFactor();
  
      m_size = newSize;
  
      ViewportAnchor viewportAnchor(&localFrameRootTemporary()->frame()->eventHandler());
      if (shouldAnchorAndRescaleViewport) {
          viewportAnchor.setAnchor(
              view->visibleContentRect(),
              visibleRectInDocument(),
              FloatSize(viewportAnchorXCoord, viewportAnchorYCoord));
      }
  
      // FIXME: TextAutosizer does not yet support out-of-process frames.
      if (mainFrameImpl() && mainFrameImpl()->frame()->isLocalFrame())
      {
          // Avoids unnecessary invalidations while various bits of state in TextAutosizer are updated.
          TextAutosizer::DeferUpdatePageInfo deferUpdatePageInfo(page());
          performResize();
      } else {
          performResize();
      }
  
      m_fullscreenController->updateSize();
  
      if (settings()->viewportEnabled()) {
          PinchViewport& pinchViewport = page()->frameHost().pinchViewport();
          FloatPoint viewportOffsetBeforeResize = pinchViewport.visibleRectInDocument().location();
  
          // Relayout immediately to recalculate the minimum scale limit.
          if (view->needsLayout())
              view->layout();
  
          if (shouldAnchorAndRescaleViewport) {
              float newPageScaleFactor = oldPageScaleFactor / oldMinimumPageScaleFactor * minimumPageScaleFactor();
              newPageScaleFactor = clampPageScaleFactorToLimits(newPageScaleFactor);
  
              FloatSize pinchViewportSize = FloatSize(newSize);
              pinchViewportSize.scale(1 / newPageScaleFactor);
  
              IntPoint mainFrameOrigin;
              FloatPoint pinchViewportOrigin;
              viewportAnchor.computeOrigins(*view, pinchViewportSize,
                  mainFrameOrigin, pinchViewportOrigin);
              scrollAndRescaleViewports(newPageScaleFactor, mainFrameOrigin, pinchViewportOrigin);
          } else {
              FloatSize deltaFromResize = viewportOffsetBeforeResize - pinchViewport.visibleRectInDocument().location();
              pinchViewport.move(FloatPoint(deltaFromResize));
          }
      }
  
      sendResizeEventAndRepaint();
  }
  
  IntRect WebViewImpl::visibleRectInDocument() const
  {
      if (pinchVirtualViewportEnabled()) {
          // Inner viewport in the document coordinates
          return enclosedIntRect(page()->frameHost().pinchViewport().visibleRectInDocument());
      }
  
      // Outer viewport in the document coordinates
      return localFrameRootTemporary()->frameView()->visibleContentRect();
  }
  
  void WebViewImpl::willEndLiveResize()
  {
      if (mainFrameImpl() && mainFrameImpl()->frameView())
          mainFrameImpl()->frameView()->willEndLiveResize();
  
      LocalFrame* frame = mainFrameImpl()->frame();
      WebPluginContainerImpl* pluginContainer = WebLocalFrameImpl::pluginContainerFromFrame(frame);
      if (pluginContainer)
          pluginContainer->willEndLiveResize();
  }
  
  void WebViewImpl::didEnterFullScreen()
  {
      m_fullscreenController->didEnterFullScreen();
  }
  
  void WebViewImpl::didExitFullScreen()
  {
      m_fullscreenController->didExitFullScreen();
  }
  
  void WebViewImpl::beginFrame(const WebBeginFrameArgs& frameTime)
  {
      TRACE_EVENT0("blink", "WebViewImpl::beginFrame");
  
      WebBeginFrameArgs validFrameTime(frameTime);
      if (!validFrameTime.lastFrameTimeMonotonic)
          validFrameTime.lastFrameTimeMonotonic = monotonicallyIncreasingTime();
  
      // Create synthetic wheel events as necessary for fling.
      if (m_gestureAnimation) {
          if (m_gestureAnimation->animate(validFrameTime.lastFrameTimeMonotonic))
              scheduleAnimation();
          else {
              endActiveFlingAnimation();
  
              PlatformGestureEvent endScrollEvent(PlatformEvent::GestureScrollEnd,
                  m_positionOnFlingStart, m_globalPositionOnFlingStart,
                  IntSize(), 0, false, false, false, false,
                  0, 0, 0, 0, false);
  
              mainFrameImpl()->frame()->eventHandler().handleGestureScrollEnd(endScrollEvent);
          }
      }
  
      if (!m_page)
          return;
  
      // FIXME: This should probably be using the local root?
      if (m_page->mainFrame()->isLocalFrame())
          PageWidgetDelegate::animate(*m_page, validFrameTime.lastFrameTimeMonotonic, *m_page->deprecatedLocalMainFrame());
  
      if (m_continuousPaintingEnabled) {
          ContinuousPainter::setNeedsDisplayRecursive(m_rootGraphicsLayer, m_pageOverlays.get());
          m_client->scheduleAnimation();
      }
  }
  
  void WebViewImpl::layout()
  {
      TRACE_EVENT0("blink", "WebViewImpl::layout");
      if (!localFrameRootTemporary())
          return;
  
      if (m_devToolsAgent)
          m_devToolsAgent->willLayout();
  
      PageWidgetDelegate::layout(*m_page, *localFrameRootTemporary()->frame());
      updateLayerTreeBackgroundColor();
  
      for (size_t i = 0; i < m_linkHighlights.size(); ++i)
          m_linkHighlights[i]->updateGeometry();
  }
  
  void WebViewImpl::paint(WebCanvas* canvas, const WebRect& rect)
  {
      // This should only be used when compositing is not being used for this
      // WebView, and it is painting into the recording of its parent.
      ASSERT(!isAcceleratedCompositingActive());
  
      double paintStart = currentTime();
      PageWidgetDelegate::paint(*m_page, pageOverlays(), canvas, rect, isTransparent() ? PageWidgetDelegate::Translucent : PageWidgetDelegate::Opaque, *m_page->deprecatedLocalMainFrame());
      double paintEnd = currentTime();
      double pixelsPerSec = (rect.width * rect.height) / (paintEnd - paintStart);
      Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintDurationMS", (paintEnd - paintStart) * 1000, 0, 120, 30);
      Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintMegapixPerSecond", pixelsPerSec / 1000000, 10, 210, 30);
  }
  
  #if OS(ANDROID)
  void WebViewImpl::paintCompositedDeprecated(WebCanvas* canvas, const WebRect& rect)
  {
      // Note: This method exists on OS(ANDROID) and will hopefully be
      //       removed once the link disambiguation feature renders using
      //       the compositor.
      ASSERT(isAcceleratedCompositingActive());
  
      FrameView* view = page()->deprecatedLocalMainFrame()->view();
      PaintBehavior oldPaintBehavior = view->paintBehavior();
      view->setPaintBehavior(oldPaintBehavior | PaintBehaviorFlattenCompositingLayers);
  
      PageWidgetDelegate::paint(*m_page, pageOverlays(), canvas, rect, isTransparent() ? PageWidgetDelegate::Translucent : PageWidgetDelegate::Opaque, *m_page->deprecatedLocalMainFrame());
  
      view->setPaintBehavior(oldPaintBehavior);
  }
  #endif
  
  void WebViewImpl::compositeAndReadbackAsync(WebCompositeAndReadbackAsyncCallback* callback)
  {
      m_layerTreeView->compositeAndReadbackAsync(callback);
  }
  
  bool WebViewImpl::isTrackingRepaints() const
  {
      if (!page())
          return false;
      if (!page()->mainFrame()->isLocalFrame())
          return false;
      FrameView* view = page()->deprecatedLocalMainFrame()->view();
      return view->isTrackingPaintInvalidations();
  }
  
  void WebViewImpl::themeChanged()
  {
      if (!page())
          return;
      if (!page()->mainFrame()->isLocalFrame())
          return;
      FrameView* view = page()->deprecatedLocalMainFrame()->view();
  
      WebRect damagedRect(0, 0, m_size.width, m_size.height);
      view->invalidateRect(damagedRect);
  }
  
  void WebViewImpl::enterFullScreenForElement(Element* element)
  {
      m_fullscreenController->enterFullScreenForElement(element);
  }
  
  void WebViewImpl::exitFullScreenForElement(Element* element)
  {
      m_fullscreenController->exitFullScreenForElement(element);
  }
  
  void WebViewImpl::clearCompositedSelectionBounds()
  {
      if (m_layerTreeView)
          m_layerTreeView->clearSelection();
  }
  
  void WebViewImpl::updateCompositedSelectionBounds(const WebSelectionBound& anchor, const WebSelectionBound& focus)
  {
      if (m_layerTreeView)
          m_layerTreeView->registerSelection(anchor, focus);
  }
  
  bool WebViewImpl::hasHorizontalScrollbar()
  {
      return mainFrameImpl()->frameView()->horizontalScrollbar();
  }
  
  bool WebViewImpl::hasVerticalScrollbar()
  {
      return mainFrameImpl()->frameView()->verticalScrollbar();
  }
  
  const WebInputEvent* WebViewImpl::m_currentInputEvent = nullptr;
  
  // FIXME: autogenerate this kind of code, and use it throughout Blink rather than
  // the one-offs for subsets of these values.
  static String inputTypeToName(WebInputEvent::Type type)
  {
      switch (type) {
      case WebInputEvent::MouseDown:
          return EventTypeNames::mousedown;
      case WebInputEvent::MouseUp:
          return EventTypeNames::mouseup;
      case WebInputEvent::MouseMove:
          return EventTypeNames::mousemove;
      case WebInputEvent::MouseEnter:
          return EventTypeNames::mouseenter;
      case WebInputEvent::MouseLeave:
          return EventTypeNames::mouseleave;
      case WebInputEvent::ContextMenu:
          return EventTypeNames::contextmenu;
      case WebInputEvent::MouseWheel:
          return EventTypeNames::mousewheel;
      case WebInputEvent::KeyDown:
          return EventTypeNames::keydown;
      case WebInputEvent::KeyUp:
          return EventTypeNames::keyup;
      case WebInputEvent::GestureScrollBegin:
          return EventTypeNames::gesturescrollstart;
      case WebInputEvent::GestureScrollEnd:
          return EventTypeNames::gesturescrollend;
      case WebInputEvent::GestureScrollUpdate:
          return EventTypeNames::gesturescrollupdate;
      case WebInputEvent::GestureTapDown:
          return EventTypeNames::gesturetapdown;
      case WebInputEvent::GestureShowPress:
          return EventTypeNames::gestureshowpress;
      case WebInputEvent::GestureTap:
          return EventTypeNames::gesturetap;
      case WebInputEvent::GestureTapUnconfirmed:
          return EventTypeNames::gesturetapunconfirmed;
      case WebInputEvent::TouchStart:
          return EventTypeNames::touchstart;
      case WebInputEvent::TouchMove:
          return EventTypeNames::touchmove;
      case WebInputEvent::TouchEnd:
          return EventTypeNames::touchend;
      case WebInputEvent::TouchCancel:
          return EventTypeNames::touchcancel;
      default:
          return String("unknown");
      }
  }
  
  bool WebViewImpl::handleInputEvent(const WebInputEvent& inputEvent)
  {
      WebAutofillClient* autofillClient = mainFrameImpl() ? mainFrameImpl()->autofillClient() : 0;
      UserGestureNotifier notifier(autofillClient, &m_userGestureObserved);
      // On the first input event since page load, |notifier| instructs the
      // autofill client to unblock values of password input fields of any forms
      // on the page. There is a single input event, GestureTap, which can both
      // be the first event after page load, and cause a form submission. In that
      // case, the form submission happens before the autofill client is told
      // to unblock the password values, and so the password values are not
      // submitted. To avoid that, GestureTap is handled explicitly:
      if (inputEvent.type == WebInputEvent::GestureTap && autofillClient) {
          m_userGestureObserved = true;
          autofillClient->firstUserGestureObserved();
      }
  
      TRACE_EVENT1("input", "WebViewImpl::handleInputEvent", "type", inputTypeToName(inputEvent.type).ascii());
      // If we've started a drag and drop operation, ignore input events until
      // we're done.
      if (m_doingDragAndDrop)
          return true;
  
      if (m_devToolsAgent && m_devToolsAgent->handleInputEvent(m_page.get(), inputEvent))
          return true;
  
      // Report the event to be NOT processed by WebKit, so that the browser can handle it appropriately.
      if (m_ignoreInputEvents)
          return false;
  
      TemporaryChange<const WebInputEvent*> currentEventChange(m_currentInputEvent, &inputEvent);
  
      if (isPointerLocked() && WebInputEvent::isMouseEventType(inputEvent.type)) {
          pointerLockMouseEvent(inputEvent);
          return true;
      }
  
      if (m_mouseCaptureNode && WebInputEvent::isMouseEventType(inputEvent.type)) {
          TRACE_EVENT1("input", "captured mouse event", "type", inputEvent.type);
          // Save m_mouseCaptureNode since mouseCaptureLost() will clear it.
          RefPtrWillBeRawPtr<Node> node = m_mouseCaptureNode;
  
          // Not all platforms call mouseCaptureLost() directly.
          if (inputEvent.type == WebInputEvent::MouseUp)
              mouseCaptureLost();
  
          OwnPtr<UserGestureIndicator> gestureIndicator;
  
          AtomicString eventType;
          switch (inputEvent.type) {
          case WebInputEvent::MouseMove:
              eventType = EventTypeNames::mousemove;
              break;
          case WebInputEvent::MouseLeave:
              eventType = EventTypeNames::mouseout;
              break;
          case WebInputEvent::MouseDown:
              eventType = EventTypeNames::mousedown;
              gestureIndicator = adoptPtr(new UserGestureIndicator(DefinitelyProcessingNewUserGesture));
              m_mouseCaptureGestureToken = gestureIndicator->currentToken();
              break;
          case WebInputEvent::MouseUp:
              eventType = EventTypeNames::mouseup;
              gestureIndicator = adoptPtr(new UserGestureIndicator(m_mouseCaptureGestureToken.release()));
              break;
          default:
              ASSERT_NOT_REACHED();
          }
  
          node->dispatchMouseEvent(
              PlatformMouseEventBuilder(mainFrameImpl()->frameView(), static_cast<const WebMouseEvent&>(inputEvent)),
              eventType, static_cast<const WebMouseEvent&>(inputEvent).clickCount);
          return true;
      }
  
      // FIXME: This should take in the intended frame, not the local frame root.
      return PageWidgetDelegate::handleInputEvent(*this, inputEvent, localFrameRootTemporary()->frame());
  }
  
  void WebViewImpl::setCursorVisibilityState(bool isVisible)
  {
      if (m_page)
          m_page->setIsCursorVisible(isVisible);
  }
  
  void WebViewImpl::mouseCaptureLost()
  {
      TRACE_EVENT_ASYNC_END0("input", "capturing mouse", this);
      m_mouseCaptureNode = nullptr;
  }
  
  void WebViewImpl::setFocus(bool enable)
  {
      m_page->focusController().setFocused(enable);
      if (enable) {
          m_page->focusController().setActive(true);
          RefPtrWillBeRawPtr<Frame> focusedFrame = m_page->focusController().focusedFrame();
          if (focusedFrame && focusedFrame->isLocalFrame()) {
              LocalFrame* localFrame = toLocalFrame(focusedFrame.get());
              Element* element = localFrame->document()->focusedElement();
              if (element && localFrame->selection().selection().isNone()) {
                  // If the selection was cleared while the WebView was not
                  // focused, then the focus element shows with a focus ring but
                  // no caret and does respond to keyboard inputs.
                  if (element->isTextFormControl()) {
                      element->updateFocusAppearance(true);
                  } else if (element->isContentEditable()) {
                      // updateFocusAppearance() selects all the text of
                      // contentseditable DIVs. So we set the selection explicitly
                      // instead. Note that this has the side effect of moving the
                      // caret back to the beginning of the text.
                      Position position(element, 0, Position::PositionIsOffsetInAnchor);
                      localFrame->selection().setSelection(VisibleSelection(position, SEL_DEFAULT_AFFINITY));
                  }
              }
          }
          m_imeAcceptEvents = true;
      } else {
          hidePopups();
  
          // Clear focus on the currently focused frame if any.
          if (!m_page)
              return;
  
          LocalFrame* frame = m_page->mainFrame() && m_page->mainFrame()->isLocalFrame()
              ? m_page->deprecatedLocalMainFrame() : 0;
          if (!frame)
              return;
  
          RefPtrWillBeRawPtr<Frame> focusedFrame = m_page->focusController().focusedFrame();
          if (focusedFrame && focusedFrame->isLocalFrame()) {
              // Finish an ongoing composition to delete the composition node.
              if (toLocalFrame(focusedFrame.get())->inputMethodController().hasComposition()) {
                  WebAutofillClient* autofillClient = WebLocalFrameImpl::fromFrame(toLocalFrame(focusedFrame.get()))->autofillClient();
  
                  if (autofillClient)
                      autofillClient->setIgnoreTextChanges(true);
  
                  toLocalFrame(focusedFrame.get())->inputMethodController().confirmComposition();
  
                  if (autofillClient)
                      autofillClient->setIgnoreTextChanges(false);
              }
              m_imeAcceptEvents = false;
          }
      }
  }
  
  bool WebViewImpl::setComposition(
      const WebString& text,
      const WebVector<WebCompositionUnderline>& underlines,
      int selectionStart,
      int selectionEnd)
  {
      LocalFrame* focused = toLocalFrame(focusedCoreFrame());
      if (!focused || !m_imeAcceptEvents)
          return false;
  
      if (WebPlugin* plugin = focusedPluginIfInputMethodSupported(focused))
          return plugin->setComposition(text, underlines, selectionStart, selectionEnd);
  
      // The input focus has been moved to another WebWidget object.
      // We should use this |editor| object only to complete the ongoing
      // composition.
      InputMethodController& inputMethodController = focused->inputMethodController();
      if (!focused->editor().canEdit() && !inputMethodController.hasComposition())
          return false;
  
      // We should verify the parent node of this IME composition node are
      // editable because JavaScript may delete a parent node of the composition
      // node. In this case, WebKit crashes while deleting texts from the parent
      // node, which doesn't exist any longer.
      RefPtrWillBeRawPtr<Range> range = inputMethodController.compositionRange();
      if (range) {
          Node* node = range->startContainer();
          if (!node || !node->isContentEditable())
              return false;
      }
  
      // If we're not going to fire a keypress event, then the keydown event was
      // canceled.  In that case, cancel any existing composition.
      if (text.isEmpty() || m_suppressNextKeypressEvent) {
          // A browser process sent an IPC message which does not contain a valid
          // string, which means an ongoing composition has been canceled.
          // If the ongoing composition has been canceled, replace the ongoing
          // composition string with an empty string and complete it.
          String emptyString;
          Vector<CompositionUnderline> emptyUnderlines;
          inputMethodController.setComposition(emptyString, emptyUnderlines, 0, 0);
          return text.isEmpty();
      }
  
      // When the range of composition underlines overlap with the range between
      // selectionStart and selectionEnd, WebKit somehow won't paint the selection
      // at all (see InlineTextBox::paint() function in InlineTextBox.cpp).
      // But the selection range actually takes effect.
      inputMethodController.setComposition(String(text),
                             CompositionUnderlineVectorBuilder(underlines),
                             selectionStart, selectionEnd);
  
      return inputMethodController.hasComposition();
  }
  
  bool WebViewImpl::confirmComposition()
  {
      return confirmComposition(DoNotKeepSelection);
  }
  
  bool WebViewImpl::confirmComposition(ConfirmCompositionBehavior selectionBehavior)
  {
      return confirmComposition(WebString(), selectionBehavior);
  }
  
  bool WebViewImpl::confirmComposition(const WebString& text)
  {
      return confirmComposition(text, DoNotKeepSelection);
  }
  
  bool WebViewImpl::confirmComposition(const WebString& text, ConfirmCompositionBehavior selectionBehavior)
  {
      LocalFrame* focused = toLocalFrame(focusedCoreFrame());
      if (!focused || !m_imeAcceptEvents)
          return false;
  
      if (WebPlugin* plugin = focusedPluginIfInputMethodSupported(focused))
          return plugin->confirmComposition(text, selectionBehavior);
  
      return focused->inputMethodController().confirmCompositionOrInsertText(text, selectionBehavior == KeepSelection ? InputMethodController::KeepSelection : InputMethodController::DoNotKeepSelection);
  }
  
  bool WebViewImpl::compositionRange(size_t* location, size_t* length)
  {
      // FIXME: Long term, the focused frame should be a local frame. For now,
      // return early to avoid crashes.
      Frame* frame = focusedCoreFrame();
      if (!frame || frame->isRemoteFrame())
          return false;
  
      LocalFrame* focused = toLocalFrame(frame);
      if (!focused || !m_imeAcceptEvents)
          return false;
  
      RefPtrWillBeRawPtr<Range> range = focused->inputMethodController().compositionRange();
      if (!range)
          return false;
  
      Element* editable = focused->selection().rootEditableElementOrDocumentElement();
      ASSERT(editable);
      PlainTextRange plainTextRange(PlainTextRange::create(*editable, *range.get()));
      if (plainTextRange.isNull())
          return false;
      *location = plainTextRange.start();
      *length = plainTextRange.length();
      return true;
  }
  
  WebTextInputInfo WebViewImpl::textInputInfo()
  {
      WebTextInputInfo info;
  
      Frame* focusedFrame = focusedCoreFrame();
      if (!focusedFrame->isLocalFrame())
          return info;
  
      LocalFrame* focused = toLocalFrame(focusedFrame);
      if (!focused)
          return info;
  
      FrameSelection& selection = focused->selection();
      Element* element = selection.selection().rootEditableElement();
      if (!element)
          return info;
  
      info.inputMode = inputModeOfFocusedElement();
  
      info.type = textInputType();
      info.flags = textInputFlags();
      if (info.type == WebTextInputTypeNone)
          return info;
  
      if (!focused->editor().canEdit())
          return info;
  
      // Emits an object replacement character for each replaced element so that
      // it is exposed to IME and thus could be deleted by IME on android.
      info.value = plainText(rangeOfContents(element).get(), TextIteratorEmitsObjectReplacementCharacter);
  
      if (info.value.isEmpty())
          return info;
  
      if (RefPtrWillBeRawPtr<Range> range = selection.selection().firstRange()) {
          PlainTextRange plainTextRange(PlainTextRange::create(*element, *range.get()));
          if (plainTextRange.isNotNull()) {
              info.selectionStart = plainTextRange.start();
              info.selectionEnd = plainTextRange.end();
          }
      }
  
      if (RefPtrWillBeRawPtr<Range> range = focused->inputMethodController().compositionRange()) {
          PlainTextRange plainTextRange(PlainTextRange::create(*element, *range.get()));
          if (plainTextRange.isNotNull()) {
              info.compositionStart = plainTextRange.start();
              info.compositionEnd = plainTextRange.end();
          }
      }
  
      return info;
  }
  
  WebTextInputType WebViewImpl::textInputType()
  {
      Element* element = focusedElement();
      if (!element)
          return WebTextInputTypeNone;
  
      if (isHTMLInputElement(*element)) {
          HTMLInputElement& input = toHTMLInputElement(*element);
          const AtomicString& type = input.type();
  
          if (input.isDisabledOrReadOnly())
              return WebTextInputTypeNone;
  
          if (type == InputTypeNames::password)
              return WebTextInputTypePassword;
          if (type == InputTypeNames::search)
              return WebTextInputTypeSearch;
          if (type == InputTypeNames::email)
              return WebTextInputTypeEmail;
          if (type == InputTypeNames::number)
              return WebTextInputTypeNumber;
          if (type == InputTypeNames::tel)
              return WebTextInputTypeTelephone;
          if (type == InputTypeNames::url)
              return WebTextInputTypeURL;
          if (type == InputTypeNames::date)
              return WebTextInputTypeDate;
          if (type == InputTypeNames::datetime_local)
              return WebTextInputTypeDateTimeLocal;
          if (type == InputTypeNames::month)
              return WebTextInputTypeMonth;
          if (type == InputTypeNames::time)
              return WebTextInputTypeTime;
          if (type == InputTypeNames::week)
              return WebTextInputTypeWeek;
          if (type == InputTypeNames::text)
              return WebTextInputTypeText;
  
          return WebTextInputTypeNone;
      }
  
      if (isHTMLTextAreaElement(*element)) {
          if (toHTMLTextAreaElement(*element).isDisabledOrReadOnly())
              return WebTextInputTypeNone;
          return WebTextInputTypeTextArea;
      }
  
  #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
      if (element->isHTMLElement()) {
          if (toHTMLElement(element)->isDateTimeFieldElement())
              return WebTextInputTypeDateTimeField;
      }
  #endif
  
      if (element->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable))
          return WebTextInputTypeContentEditable;
  
      return WebTextInputTypeNone;
  }
  
  int WebViewImpl::textInputFlags()
  {
      Element* element = focusedElement();
      if (!element)
          return WebTextInputFlagNone;
  
      DEFINE_STATIC_LOCAL(AtomicString, autocompleteString, ("autocomplete", AtomicString::ConstructFromLiteral));
      DEFINE_STATIC_LOCAL(AtomicString, autocorrectString, ("autocorrect", AtomicString::ConstructFromLiteral));
      DEFINE_STATIC_LOCAL(AtomicString, spellcheckString, ("spellcheck", AtomicString::ConstructFromLiteral));
      int flags = 0;
  
      const AtomicString& autocomplete = element->getAttribute(autocompleteString);
      if (autocomplete == "on")
          flags |= WebTextInputFlagAutocompleteOn;
      else if (autocomplete == "off")
          flags |= WebTextInputFlagAutocompleteOff;
  
      const AtomicString& autocorrect = element->getAttribute(autocorrectString);
      if (autocorrect == "on")
          flags |= WebTextInputFlagAutocorrectOn;
      else if (autocorrect == "off")
          flags |= WebTextInputFlagAutocorrectOff;
  
      const AtomicString& spellcheck = element->getAttribute(spellcheckString);
      if (spellcheck == "on")
          flags |= WebTextInputFlagSpellcheckOn;
      else if (spellcheck == "off")
          flags |= WebTextInputFlagSpellcheckOff;
  
      return flags;
  }
  
  WebString WebViewImpl::inputModeOfFocusedElement()
  {
      if (!RuntimeEnabledFeatures::inputModeAttributeEnabled())
          return WebString();
  
      Element* element = focusedElement();
      if (!element)
          return WebString();
  
      if (isHTMLInputElement(*element)) {
          const HTMLInputElement& input = toHTMLInputElement(*element);
          if (input.supportsInputModeAttribute())
              return input.fastGetAttribute(HTMLNames::inputmodeAttr).lower();
          return WebString();
      }
      if (isHTMLTextAreaElement(*element)) {
          const HTMLTextAreaElement& textarea = toHTMLTextAreaElement(*element);
          return textarea.fastGetAttribute(HTMLNames::inputmodeAttr).lower();
      }
  
      return WebString();
  }
  
  bool WebViewImpl::selectionBounds(WebRect& anchor, WebRect& focus) const
  {
      const Frame* frame = focusedCoreFrame();
      if (!frame || !frame->isLocalFrame())
          return false;
  
      const LocalFrame* localFrame = toLocalFrame(frame);
      if (!localFrame)
          return false;
      FrameSelection& selection = localFrame->selection();
  
      if (selection.isCaret()) {
          anchor = focus = selection.absoluteCaretBounds();
      } else {
          RefPtrWillBeRawPtr<Range> selectedRange = selection.toNormalizedRange();
          if (!selectedRange)
              return false;
  
          RefPtrWillBeRawPtr<Range> range(Range::create(selectedRange->startContainer()->document(),
              selectedRange->startContainer(),
              selectedRange->startOffset(),
              selectedRange->startContainer(),
              selectedRange->startOffset()));
          anchor = localFrame->editor().firstRectForRange(range.get());
  
          range = Range::create(selectedRange->endContainer()->document(),
              selectedRange->endContainer(),
              selectedRange->endOffset(),
              selectedRange->endContainer(),
              selectedRange->endOffset());
          focus = localFrame->editor().firstRectForRange(range.get());
      }
  
      IntRect scaledAnchor(localFrame->view()->contentsToWindow(anchor));
      IntRect scaledFocus(localFrame->view()->contentsToWindow(focus));
  
      if (pinchVirtualViewportEnabled()) {
          // FIXME(http://crbug.com/371902) - We shouldn't have to do this
          // manually, the contentsToWindow methods above should be fixed to do
          // this.
          IntPoint pinchViewportOffset =
              roundedIntPoint(page()->frameHost().pinchViewport().visibleRect().location());
          scaledAnchor.moveBy(-pinchViewportOffset);
          scaledFocus.moveBy(-pinchViewportOffset);
      }
  
      scaledAnchor.scale(pageScaleFactor());
      scaledFocus.scale(pageScaleFactor());
      anchor = scaledAnchor;
      focus = scaledFocus;
  
      if (!selection.selection().isBaseFirst())
          std::swap(anchor, focus);
      return true;
  }
  
  InputMethodContext* WebViewImpl::inputMethodContext()
  {
      if (!m_imeAcceptEvents)
          return 0;
  
      LocalFrame* focusedFrame = toLocalFrame(focusedCoreFrame());
      if (!focusedFrame)
          return 0;
  
      Element* target = focusedFrame->document()->focusedElement();
      if (target && target->hasInputMethodContext())
          return &target->inputMethodContext();
  
      return 0;
  }
  
  WebPlugin* WebViewImpl::focusedPluginIfInputMethodSupported(LocalFrame* frame)
  {
      WebPluginContainerImpl* container = WebLocalFrameImpl::pluginContainerFromNode(frame, WebNode(focusedElement()));
      if (container && container->supportsInputMethod())
          return container->plugin();
      return 0;
  }
  
  void WebViewImpl::didShowCandidateWindow()
  {
      if (InputMethodContext* context = inputMethodContext())
          context->dispatchCandidateWindowShowEvent();
  }
  
  void WebViewImpl::didUpdateCandidateWindow()
  {
      if (InputMethodContext* context = inputMethodContext())
          context->dispatchCandidateWindowUpdateEvent();
  }
  
  void WebViewImpl::didHideCandidateWindow()
  {
      if (InputMethodContext* context = inputMethodContext())
          context->dispatchCandidateWindowHideEvent();
  }
  
  bool WebViewImpl::selectionTextDirection(WebTextDirection& start, WebTextDirection& end) const
  {
      const Frame* frame = focusedCoreFrame();
      if (!frame || frame->isRemoteFrame())
          return false;
      FrameSelection& selection = toLocalFrame(frame)->selection();
      if (!selection.toNormalizedRange())
          return false;
      start = toWebTextDirection(selection.start().primaryDirection());
      end = toWebTextDirection(selection.end().primaryDirection());
      return true;
  }
  
  bool WebViewImpl::isSelectionAnchorFirst() const
  {
      const Frame* frame = focusedCoreFrame();
      if (!frame || frame->isRemoteFrame())
          return false;
      return toLocalFrame(frame)->selection().selection().isBaseFirst();
  }
  
  WebVector<WebCompositionUnderline> WebViewImpl::compositionUnderlines() const
  {
      const LocalFrame* focused = toLocalFrame(focusedCoreFrame());
      if (!focused)
          return WebVector<WebCompositionUnderline>();
      const Vector<CompositionUnderline>& underlines = focused->inputMethodController().customCompositionUnderlines();
      WebVector<WebCompositionUnderline> results(underlines.size());
      for (size_t index = 0; index < underlines.size(); ++index) {
          CompositionUnderline underline = underlines[index];
          results[index] = WebCompositionUnderline(underline.startOffset, underline.endOffset, static_cast<WebColor>(underline.color.rgb()), underline.thick, static_cast<WebColor>(underline.backgroundColor.rgb()));
      }
      return results;
  }
  
  WebColor WebViewImpl::backgroundColor() const
  {
      if (isTransparent())
          return Color::transparent;
      if (!m_page)
          return m_baseBackgroundColor;
      if (!m_page->mainFrame())
          return m_baseBackgroundColor;
      if (!m_page->mainFrame()->isLocalFrame())
          return m_baseBackgroundColor;
      FrameView* view = m_page->deprecatedLocalMainFrame()->view();
      return view->documentBackgroundColor().rgb();
  }
  
  WebPagePopup* WebViewImpl::pagePopup() const
  {
      return m_pagePopup.get();
  }
  
  bool WebViewImpl::caretOrSelectionRange(size_t* location, size_t* length)
  {
      const LocalFrame* focused = toLocalFrame(focusedCoreFrame());
      if (!focused)
          return false;
  
      PlainTextRange selectionOffsets = focused->inputMethodController().getSelectionOffsets();
      if (selectionOffsets.isNull())
          return false;
  
      *location = selectionOffsets.start();
      *length = selectionOffsets.length();
      return true;
  }
  
  void WebViewImpl::setTextDirection(WebTextDirection direction)
  {
      // The Editor::setBaseWritingDirection() function checks if we can change
      // the text direction of the selected node and updates its DOM "dir"
      // attribute and its CSS "direction" property.
      // So, we just call the function as Safari does.
      const LocalFrame* focused = toLocalFrame(focusedCoreFrame());
      if (!focused)
          return;
  
      Editor& editor = focused->editor();
      if (!editor.canEdit())
          return;
  
      switch (direction) {
      case WebTextDirectionDefault:
          editor.setBaseWritingDirection(NaturalWritingDirection);
          break;
  
      case WebTextDirectionLeftToRight:
          editor.setBaseWritingDirection(LeftToRightWritingDirection);
          break;
  
      case WebTextDirectionRightToLeft:
          editor.setBaseWritingDirection(RightToLeftWritingDirection);
          break;
  
      default:
          notImplemented();
          break;
      }
  }
  
  bool WebViewImpl::isAcceleratedCompositingActive() const
  {
      return m_isAcceleratedCompositingActive;
  }
  
  void WebViewImpl::willCloseLayerTreeView()
  {
      setIsAcceleratedCompositingActive(false);
      m_layerTreeView = 0;
      m_layerTreeViewClosed = true;
  }
  
  void WebViewImpl::didAcquirePointerLock()
  {
      if (page())
          page()->pointerLockController().didAcquirePointerLock();
  }
  
  void WebViewImpl::didNotAcquirePointerLock()
  {
      if (page())
          page()->pointerLockController().didNotAcquirePointerLock();
  }
  
  void WebViewImpl::didLosePointerLock()
  {
      m_pointerLockGestureToken.clear();
      if (page())
          page()->pointerLockController().didLosePointerLock();
  }
  
  void WebViewImpl::didChangeWindowResizerRect()
  {
      if (mainFrameImpl()->frameView())
          mainFrameImpl()->frameView()->windowResizerRectChanged();
  }
  
  // WebView --------------------------------------------------------------------
  
  WebSettingsImpl* WebViewImpl::settingsImpl()
  {
      if (!m_webSettings)
          m_webSettings = adoptPtr(new WebSettingsImpl(&m_page->settings(), &m_page->inspectorController()));
      ASSERT(m_webSettings);
      return m_webSettings.get();
  }
  
  WebSettings* WebViewImpl::settings()
  {
      return settingsImpl();
  }
  
  WebString WebViewImpl::pageEncoding() const
  {
      if (!m_page)
          return WebString();
  
      if (!m_page->mainFrame()->isLocalFrame())
          return WebString();
  
      // FIXME: Is this check needed?
      if (!m_page->deprecatedLocalMainFrame()->document()->loader())
          return WebString();
  
      return m_page->deprecatedLocalMainFrame()->document()->encodingName();
  }
  
  void WebViewImpl::setPageEncoding(const WebString& encodingName)
  {
      if (!m_page)
          return;
  
      // Only change override encoding, don't change default encoding.
      // Note that the new encoding must be 0 if it isn't supposed to be set.
      AtomicString newEncodingName;
      if (!encodingName.isEmpty())
          newEncodingName = encodingName;
      m_page->frameHost().setOverrideEncoding(newEncodingName);
  
      if (m_page->mainFrame()->isLocalFrame())
          m_page->deprecatedLocalMainFrame()->loader().reload(NormalReload);
  }
  
  WebFrame* WebViewImpl::mainFrame()
  {
      return WebFrame::fromFrame(m_page ? m_page->mainFrame() : 0);
  }
  
  WebFrame* WebViewImpl::findFrameByName(
      const WebString& name, WebFrame* relativeToFrame)
  {
      // FIXME: Either this should only deal with WebLocalFrames or it should move to WebFrame.
      if (!relativeToFrame)
          relativeToFrame = mainFrame();
      Frame* frame = toWebLocalFrameImpl(relativeToFrame)->frame();
      frame = frame->tree().find(name);
      if (!frame || !frame->isLocalFrame())
          return 0;
      return WebLocalFrameImpl::fromFrame(toLocalFrame(frame));
  }
  
  WebFrame* WebViewImpl::focusedFrame()
  {
      return WebFrame::fromFrame(focusedCoreFrame());
  }
  
  void WebViewImpl::setFocusedFrame(WebFrame* frame)
  {
      if (!frame) {
          // Clears the focused frame if any.
          Frame* focusedFrame = focusedCoreFrame();
          if (focusedFrame && focusedFrame->isLocalFrame())
              toLocalFrame(focusedFrame)->selection().setFocused(false);
          return;
      }
      LocalFrame* coreFrame = toWebLocalFrameImpl(frame)->frame();
      coreFrame->page()->focusController().setFocusedFrame(coreFrame);
  }
  
  void WebViewImpl::setInitialFocus(bool reverse)
  {
      if (!m_page)
          return;
      Frame* frame = page()->focusController().focusedOrMainFrame();
      if (frame->isLocalFrame()) {
          if (Document* document = toLocalFrame(frame)->document())
              document->setFocusedElement(nullptr);
      }
      page()->focusController().setInitialFocus(reverse ? FocusTypeBackward : FocusTypeForward);
  }
  
  void WebViewImpl::clearFocusedElement()
  {
      RefPtrWillBeRawPtr<Frame> frame = focusedCoreFrame();
      if (!frame || !frame->isLocalFrame())
          return;
  
      LocalFrame* localFrame = toLocalFrame(frame.get());
  
      RefPtrWillBeRawPtr<Document> document = localFrame->document();
      if (!document)
          return;
  
      RefPtrWillBeRawPtr<Element> oldFocusedElement = document->focusedElement();
  
      // Clear the focused node.
      document->setFocusedElement(nullptr);
  
      if (!oldFocusedElement)
          return;
  
      // If a text field has focus, we need to make sure the selection controller
      // knows to remove selection from it. Otherwise, the text field is still
      // processing keyboard events even though focus has been moved to the page and
      // keystrokes get eaten as a result.
      if (oldFocusedElement->isContentEditable() || oldFocusedElement->isTextFormControl())
          localFrame->selection().clear();
  }
  
  bool WebViewImpl::scrollFocusedNodeIntoRect(const WebRect& rect)
  {
      LocalFrame* frame = page()->mainFrame() && page()->mainFrame()->isLocalFrame()
          ? page()->deprecatedLocalMainFrame() : 0;
      Element* element = focusedElement();
      if (!frame || !frame->view() || !element)
          return false;
  
      if (!m_webSettings->autoZoomFocusedNodeToLegibleScale()) {
          frame->view()->scrollElementToRect(element, IntRect(rect.x, rect.y, rect.width, rect.height));
          return false;
      }
  
      float scale;
      IntPoint scroll;
      bool needAnimation;
      computeScaleAndScrollForFocusedNode(element, scale, scroll, needAnimation);
      if (needAnimation)
          return startPageScaleAnimation(scroll, false, scale, scrollAndScaleAnimationDurationInSeconds);
  
      return false;
  }
  
  void WebViewImpl::computeScaleAndScrollForFocusedNode(Node* focusedNode, float& newScale, IntPoint& newScroll, bool& needAnimation)
  {
      focusedNode->document().updateLayoutIgnorePendingStylesheets();
  
      // 'caret' is rect encompassing the blinking cursor.
      IntRect textboxRect = focusedNode->document().view()->contentsToWindow(pixelSnappedIntRect(focusedNode->Node::boundingBox()));
      WebRect caret, unusedEnd;
      selectionBounds(caret, unusedEnd);
      IntRect unscaledCaret = caret;
      unscaledCaret.scale(1 / pageScaleFactor());
      caret = unscaledCaret;
  
      if (shouldDisableDesktopWorkarounds()) {
          newScale = pageScaleFactor();
      } else {
          // Pick a scale which is reasonably readable. This is the scale at which
          // the caret height will become minReadableCaretHeightForNode (adjusted
          // for dpi and font scale factor).
          const int minReadableCaretHeightForNode = textboxRect.height() >= 2 * caret.height ? minReadableCaretHeightForTextArea : minReadableCaretHeight;
          newScale = clampPageScaleFactorToLimits(legibleScale() * minReadableCaretHeightForNode / caret.height);
          newScale = std::max(newScale, pageScaleFactor());
      }
      const float deltaScale = newScale / pageScaleFactor();
  
      needAnimation = false;
      // If we are at less than the target zoom level, zoom in.
      if (deltaScale > minScaleChangeToTriggerZoom)
          needAnimation = true;
      else
          newScale = pageScaleFactor();
  
      // Convert the rects to absolute space in the new scale.
      IntRect textboxRectInDocumentCoordinates = textboxRect;
      textboxRectInDocumentCoordinates.move(mainFrame()->scrollOffset());
      IntRect caretInDocumentCoordinates = caret;
      caretInDocumentCoordinates.move(mainFrame()->scrollOffset());
  
      int viewWidth = m_size.width / newScale;
      int viewHeight = m_size.height / newScale;
  
      // If the caret is offscreen, then animate.
      IntRect sizeRect(0, 0, viewWidth, viewHeight);
      sizeRect.scale(newScale / pageScaleFactor());
      if (!sizeRect.contains(caret))
          needAnimation = true;
  
      // If the box is partially offscreen and it's possible to bring it fully
      // onscreen, then animate.
      if (sizeRect.contains(textboxRectInDocumentCoordinates.width(), textboxRectInDocumentCoordinates.height()) && !sizeRect.contains(textboxRect))
          needAnimation = true;
  
      if (!needAnimation)
          return;
  
      if (textboxRectInDocumentCoordinates.width() <= viewWidth) {
          // Field is narrower than screen. Try to leave padding on left so field's
          // label is visible, but it's more important to ensure entire field is
          // onscreen.
          int idealLeftPadding = viewWidth * leftBoxRatio;
          int maxLeftPaddingKeepingBoxOnscreen = viewWidth - textboxRectInDocumentCoordinates.width();
          newScroll.setX(textboxRectInDocumentCoordinates.x() - std::min<int>(idealLeftPadding, maxLeftPaddingKeepingBoxOnscreen));
      } else {
          // Field is wider than screen. Try to left-align field, unless caret would
          // be offscreen, in which case right-align the caret.
          newScroll.setX(std::max<int>(textboxRectInDocumentCoordinates.x(), caretInDocumentCoordinates.x() + caretInDocumentCoordinates.width() + caretPadding - viewWidth));
      }
      if (textboxRectInDocumentCoordinates.height() <= viewHeight) {
          // Field is shorter than screen. Vertically center it.
          newScroll.setY(textboxRectInDocumentCoordinates.y() - (viewHeight - textboxRectInDocumentCoordinates.height()) / 2);
      } else {
          // Field is taller than screen. Try to top align field, unless caret would
          // be offscreen, in which case bottom-align the caret.
          newScroll.setY(std::max<int>(textboxRectInDocumentCoordinates.y(), caretInDocumentCoordinates.y() + caretInDocumentCoordinates.height() + caretPadding - viewHeight));
      }
  }
  
  void WebViewImpl::advanceFocus(bool reverse)
  {
      page()->focusController().advanceFocus(reverse ? FocusTypeBackward : FocusTypeForward);
  }
  
  double WebViewImpl::zoomLevel()
  {
      return m_zoomLevel;
  }
  
  double WebViewImpl::setZoomLevel(double zoomLevel)
  {
      if (zoomLevel < m_minimumZoomLevel)
          m_zoomLevel = m_minimumZoomLevel;
      else if (zoomLevel > m_maximumZoomLevel)
          m_zoomLevel = m_maximumZoomLevel;
      else
          m_zoomLevel = zoomLevel;
  
      LocalFrame* frame = mainFrameImpl()->frame();
      WebPluginContainerImpl* pluginContainer = WebLocalFrameImpl::pluginContainerFromFrame(frame);
      if (pluginContainer)
          pluginContainer->plugin()->setZoomLevel(m_zoomLevel, false);
      else {
          float zoomFactor = m_zoomFactorOverride ? m_zoomFactorOverride : static_cast<float>(zoomLevelToZoomFactor(m_zoomLevel));
          frame->setPageZoomFactor(zoomFactor);
      }
  
      return m_zoomLevel;
  }
  
  void WebViewImpl::zoomLimitsChanged(double minimumZoomLevel,
                                      double maximumZoomLevel)
  {
      m_minimumZoomLevel = minimumZoomLevel;
      m_maximumZoomLevel = maximumZoomLevel;
      m_client->zoomLimitsChanged(m_minimumZoomLevel, m_maximumZoomLevel);
  }
  
  float WebViewImpl::textZoomFactor()
  {
      return mainFrameImpl()->frame()->textZoomFactor();
  }
  
  float WebViewImpl::setTextZoomFactor(float textZoomFactor)
  {
      LocalFrame* frame = mainFrameImpl()->frame();
      if (WebLocalFrameImpl::pluginContainerFromFrame(frame))
          return 1;
  
      frame->setTextZoomFactor(textZoomFactor);
  
      return textZoomFactor;
  }
  
  void WebViewImpl::fullFramePluginZoomLevelChanged(double zoomLevel)
  {
      if (zoomLevel == m_zoomLevel)
          return;
  
      m_zoomLevel = std::max(std::min(zoomLevel, m_maximumZoomLevel), m_minimumZoomLevel);
      m_client->zoomLevelChanged();
  }
  
  double WebView::zoomLevelToZoomFactor(double zoomLevel)
  {
      return pow(textSizeMultiplierRatio, zoomLevel);
  }
  
  double WebView::zoomFactorToZoomLevel(double factor)
  {
      // Since factor = 1.2^level, level = log(factor) / log(1.2)
      return log(factor) / log(textSizeMultiplierRatio);
  }
  
  float WebViewImpl::pageScaleFactor() const
  {
      if (!page())
          return 1;
  
      if (!pinchVirtualViewportEnabled())
          return page()->pageScaleFactor();
  
      return page()->frameHost().pinchViewport().scale();
  }
  
  float WebViewImpl::clampPageScaleFactorToLimits(float scaleFactor) const
  {
      return m_pageScaleConstraintsSet.finalConstraints().clampToConstraints(scaleFactor);
  }
  
  IntPoint WebViewImpl::clampOffsetAtScale(const IntPoint& offset, float scale)
  {
      FrameView* view = mainFrameImpl()->frameView();
      if (!view)
          return offset;
  
      if (!pinchVirtualViewportEnabled())
          return view->clampOffsetAtScale(offset, scale);
  
      return page()->frameHost().pinchViewport().clampDocumentOffsetAtScale(offset, scale);
  }
  
  bool WebViewImpl::pinchVirtualViewportEnabled() const
  {
      ASSERT(page());
      return page()->settings().pinchVirtualViewportEnabled();
  }
  
  void WebViewImpl::setPinchViewportOffset(const WebFloatPoint& offset)
  {
      ASSERT(page());
  
      if (!pinchVirtualViewportEnabled())
          return;
  
      page()->frameHost().pinchViewport().setLocation(offset);
  }
  
  WebFloatPoint WebViewImpl::pinchViewportOffset() const
  {
      ASSERT(page());
  
      if (!pinchVirtualViewportEnabled())
          return WebFloatPoint();
  
      return page()->frameHost().pinchViewport().visibleRect().location();
  }
  
  void WebViewImpl::scrollAndRescaleViewports(float scaleFactor,
      const IntPoint& mainFrameOrigin,
      const FloatPoint& pinchViewportOrigin)
  {
      // Old way
      if (!pinchVirtualViewportEnabled()) {
          setPageScaleFactor(scaleFactor, mainFrameOrigin);
          return;
      }
  
      if (!page())
          return;
  
      if (!mainFrameImpl())
          return;
  
      FrameView * view = mainFrameImpl()->frameView();
      if (!view)
          return;
  
      // Order is important: pinch viewport location is clamped based on
      // main frame scroll position and pinch viewport scale.
  
      view->setScrollOffset(mainFrameOrigin);
  
      setPageScaleFactor(scaleFactor);
  
      page()->frameHost().pinchViewport().setLocation(pinchViewportOrigin);
  }
  
  void WebViewImpl::setPageScaleFactorAndLocation(float scaleFactor, const FloatPoint& location)
  {
      ASSERT(pinchVirtualViewportEnabled());
      ASSERT(page());
  
      page()->frameHost().pinchViewport().setScaleAndLocation(
          clampPageScaleFactorToLimits(scaleFactor),
          location);
      deviceOrPageScaleFactorChanged();
  }
  
  void WebViewImpl::setPageScaleFactor(float scaleFactor)
  {
      ASSERT(page());
  
      scaleFactor = clampPageScaleFactorToLimits(scaleFactor);
      if (scaleFactor == pageScaleFactor())
          return;
  
      // FIXME(bokan): Old-style pinch path. Remove when we're migrated to
      // virtual viewport pinch.
      if (!pinchVirtualViewportEnabled()) {
          IntPoint scrollOffset(mainFrame()->scrollOffset().width, mainFrame()->scrollOffset().height);
          setPageScaleFactor(scaleFactor, scrollOffset);
          return;
      }
  
      page()->frameHost().pinchViewport().setScale(scaleFactor);
      deviceOrPageScaleFactorChanged();
  }
  
  void WebViewImpl::setMainFrameScrollOffset(const WebPoint& origin)
  {
      updateMainFrameScrollPosition(origin, false);
  }
  
  void WebViewImpl::setPageScaleFactor(float scaleFactor, const WebPoint& origin)
  {
      if (!page())
          return;
  
      IntPoint newScrollOffset = origin;
      scaleFactor = clampPageScaleFactorToLimits(scaleFactor);
      newScrollOffset = clampOffsetAtScale(newScrollOffset, scaleFactor);
  
      if (pinchVirtualViewportEnabled())
          setPageScaleFactor(scaleFactor);
          // Note, we don't set the offset in the new path. This method is going
          // away for the new pinch model so that's ok.
      else
          page()->setPageScaleFactor(scaleFactor, newScrollOffset);
  }
  
  float WebViewImpl::deviceScaleFactor() const
  {
      if (!page())
          return 1;
  
      return page()->deviceScaleFactor();
  }
  
  void WebViewImpl::setDeviceScaleFactor(float scaleFactor)
  {
      if (!page())
          return;
  
      page()->setDeviceScaleFactor(scaleFactor);
  
      if (m_layerTreeView)
          updateLayerTreeDeviceScaleFactor();
  }
  
  void WebViewImpl::setDeviceColorProfile(const WebVector<char>& colorProfile)
  {
      if (!page())
          return;
  
      Vector<char> deviceProfile;
      deviceProfile.append(colorProfile.data(), colorProfile.size());
  
      page()->setDeviceColorProfile(deviceProfile);
  }
  
  void WebViewImpl::resetDeviceColorProfile()
  {
      if (!page())
          return;
  
      page()->resetDeviceColorProfile();
  }
  
  void WebViewImpl::enableAutoResizeMode(const WebSize& minSize, const WebSize& maxSize)
  {
      m_shouldAutoResize = true;
      m_minAutoSize = minSize;
      m_maxAutoSize = maxSize;
      configureAutoResizeMode();
  }
  
  void WebViewImpl::disableAutoResizeMode()
  {
      m_shouldAutoResize = false;
      configureAutoResizeMode();
  }
  
  void WebViewImpl::setUserAgentPageScaleConstraints(PageScaleConstraints newConstraints)
  {
      if (newConstraints == m_pageScaleConstraintsSet.userAgentConstraints())
          return;
  
      m_pageScaleConstraintsSet.setUserAgentConstraints(newConstraints);
  
      if (!mainFrameImpl() || !mainFrameImpl()->frameView())
          return;
  
      mainFrameImpl()->frameView()->setNeedsLayout();
  }
  
  void WebViewImpl::setInitialPageScaleOverride(float initialPageScaleFactorOverride)
  {
      PageScaleConstraints constraints = m_pageScaleConstraintsSet.userAgentConstraints();
      constraints.initialScale = initialPageScaleFactorOverride;
  
      if (constraints == m_pageScaleConstraintsSet.userAgentConstraints())
          return;
  
      m_pageScaleConstraintsSet.setNeedsReset(true);
      setUserAgentPageScaleConstraints(constraints);
  }
  
  void WebViewImpl::setPageScaleFactorLimits(float minPageScale, float maxPageScale)
  {
      PageScaleConstraints constraints = m_pageScaleConstraintsSet.userAgentConstraints();
      constraints.minimumScale = minPageScale;
      constraints.maximumScale = maxPageScale;
      setUserAgentPageScaleConstraints(constraints);
  }
  
  void WebViewImpl::setIgnoreViewportTagScaleLimits(bool ignore)
  {
      PageScaleConstraints constraints = m_pageScaleConstraintsSet.userAgentConstraints();
      if (ignore) {
          constraints.minimumScale = m_pageScaleConstraintsSet.defaultConstraints().minimumScale;
          constraints.maximumScale = m_pageScaleConstraintsSet.defaultConstraints().maximumScale;
      } else {
          constraints.minimumScale = -1;
          constraints.maximumScale = -1;
      }
      setUserAgentPageScaleConstraints(constraints);
  }
  
  IntSize WebViewImpl::mainFrameSize()
  {
      if (!pinchVirtualViewportEnabled() || !localFrameRootTemporary())
          return m_size;
  
      FrameView* view = localFrameRootTemporary()->frameView();
  
      if (!view)
          return m_size;
  
      int contentAndScrollbarWidth = contentsSize().width();
  
      if (view && view->verticalScrollbar() && !view->verticalScrollbar()->isOverlayScrollbar())
          contentAndScrollbarWidth += view->verticalScrollbar()->width();
  
      return m_pageScaleConstraintsSet.mainFrameSize(contentAndScrollbarWidth);
  }
  
  void WebViewImpl::refreshPageScaleFactorAfterLayout()
  {
      if (!mainFrame() || !page() || !page()->mainFrame() || !page()->mainFrame()->isLocalFrame() || !page()->deprecatedLocalMainFrame()->view())
          return;
      FrameView* view = page()->deprecatedLocalMainFrame()->view();
  
      updatePageDefinedViewportConstraints(mainFrameImpl()->frame()->document()->viewportDescription());
      m_pageScaleConstraintsSet.computeFinalConstraints();
  
      if (settings()->shrinksViewportContentToFit()) {
          int verticalScrollbarWidth = 0;
          if (view->verticalScrollbar() && !view->verticalScrollbar()->isOverlayScrollbar())
              verticalScrollbarWidth = view->verticalScrollbar()->width();
          m_pageScaleConstraintsSet.adjustFinalConstraintsToContentsSize(contentsSize(), verticalScrollbarWidth);
      }
  
      float newPageScaleFactor = pageScaleFactor();
      if (m_pageScaleConstraintsSet.needsReset() && m_pageScaleConstraintsSet.finalConstraints().initialScale != -1) {
          newPageScaleFactor = m_pageScaleConstraintsSet.finalConstraints().initialScale;
          m_pageScaleConstraintsSet.setNeedsReset(false);
      }
      setPageScaleFactor(newPageScaleFactor);
  
      updateLayerTreeViewport();
  }
  
  void WebViewImpl::updatePageDefinedViewportConstraints(const ViewportDescription& description)
  {
      if (!settings()->viewportEnabled() || !page() || (!m_size.width && !m_size.height) || !page()->mainFrame()->isLocalFrame())
          return;
  
      Document* document = page()->deprecatedLocalMainFrame()->document();
  
      m_matchesHeuristicsForGpuRasterization = description.maxWidth == Length(DeviceWidth)
          && description.minZoom == 1.0
          && description.minZoomIsExplicit;
      if (m_layerTreeView)
          m_layerTreeView->heuristicsForGpuRasterizationUpdated(m_matchesHeuristicsForGpuRasterization);
  
      Length defaultMinWidth = document->viewportDefaultMinWidth();
      if (defaultMinWidth.isAuto())
          defaultMinWidth = Length(ExtendToZoom);
  
      ViewportDescription adjustedDescription = description;
      if (settingsImpl()->viewportMetaLayoutSizeQuirk() && adjustedDescription.type == ViewportDescription::ViewportMeta) {
          const int legacyWidthSnappingMagicNumber = 320;
          if (adjustedDescription.maxWidth.isFixed() && adjustedDescription.maxWidth.value() <= legacyWidthSnappingMagicNumber)
              adjustedDescription.maxWidth = Length(DeviceWidth);
          if (adjustedDescription.maxHeight.isFixed() && adjustedDescription.maxHeight.value() <= m_size.height)
              adjustedDescription.maxHeight = Length(DeviceHeight);
          adjustedDescription.minWidth = adjustedDescription.maxWidth;
          adjustedDescription.minHeight = adjustedDescription.maxHeight;
      }
  
      float oldInitialScale = m_pageScaleConstraintsSet.pageDefinedConstraints().initialScale;
      m_pageScaleConstraintsSet.updatePageDefinedConstraints(adjustedDescription, defaultMinWidth);
  
      if (settingsImpl()->clobberUserAgentInitialScaleQuirk()
          && m_pageScaleConstraintsSet.userAgentConstraints().initialScale != -1
          && m_pageScaleConstraintsSet.userAgentConstraints().initialScale * deviceScaleFactor() <= 1) {
          if (description.maxWidth == Length(DeviceWidth)
              || (description.maxWidth.type() == Auto && m_pageScaleConstraintsSet.pageDefinedConstraints().initialScale == 1.0f))
              setInitialPageScaleOverride(-1);
      }
  
      m_pageScaleConstraintsSet.adjustForAndroidWebViewQuirks(adjustedDescription, defaultMinWidth.intValue(), deviceScaleFactor(), settingsImpl()->supportDeprecatedTargetDensityDPI(), page()->settings().wideViewportQuirkEnabled(), page()->settings().useWideViewport(), page()->settings().loadWithOverviewMode(), settingsImpl()->viewportMetaNonUserScalableQuirk());
      float newInitialScale = m_pageScaleConstraintsSet.pageDefinedConstraints().initialScale;
      if (oldInitialScale != newInitialScale && newInitialScale != -1) {
          m_pageScaleConstraintsSet.setNeedsReset(true);
          if (mainFrameImpl() && mainFrameImpl()->frameView())
              mainFrameImpl()->frameView()->setNeedsLayout();
      }
  
      updateMainFrameLayoutSize();
  
      if (LocalFrame* frame = page()->deprecatedLocalMainFrame()) {
          if (TextAutosizer* textAutosizer = frame->document()->textAutosizer())
              textAutosizer->updatePageInfoInAllFrames();
      }
  }
  
  void WebViewImpl::updateMainFrameLayoutSize()
  {
      if (m_shouldAutoResize || !mainFrameImpl())
          return;
  
      RefPtrWillBeRawPtr<FrameView> view = mainFrameImpl()->frameView();
      if (!view)
          return;
  
      WebSize layoutSize = m_size;
  
      if (settings()->viewportEnabled())
          layoutSize = flooredIntSize(m_pageScaleConstraintsSet.pageDefinedConstraints().layoutSize);
  
      if (page()->settings().forceZeroLayoutHeight())
          layoutSize.height = 0;
  
      view->setLayoutSize(layoutSize);
  }
  
  IntSize WebViewImpl::contentsSize() const
  {
      if (!page()->mainFrame()->isLocalFrame())
          return IntSize();
      RenderView* root = page()->deprecatedLocalMainFrame()->contentRenderer();
      if (!root)
          return IntSize();
      return root->documentRect().size();
  }
  
  WebSize WebViewImpl::contentsPreferredMinimumSize()
  {
      Document* document = m_page->mainFrame()->isLocalFrame() ? m_page->deprecatedLocalMainFrame()->document() : 0;
      if (!document || !document->renderView() || !document->documentElement())
          return WebSize();
  
      layout();
      int widthScaled = document->renderView()->minPreferredLogicalWidth(); // Already accounts for zoom.
      int heightScaled = static_cast<int>(document->documentElement()->scrollHeight() * zoomLevelToZoomFactor(zoomLevel()));
      return IntSize(widthScaled, heightScaled);
  }
  
  float WebViewImpl::minimumPageScaleFactor() const
  {
      return m_pageScaleConstraintsSet.finalConstraints().minimumScale;
  }
  
  float WebViewImpl::maximumPageScaleFactor() const
  {
      return m_pageScaleConstraintsSet.finalConstraints().maximumScale;
  }
  
  void WebViewImpl::resetScrollAndScaleState()
  {
      // FIXME(bokan): This is done by the pinchViewport().reset() call below and
      // can be removed when the new pinch path is the only one.
      setPageScaleFactor(1);
      updateMainFrameScrollPosition(IntPoint(), true);
      page()->frameHost().pinchViewport().reset();
  
      if (!page()->mainFrame()->isLocalFrame())
          return;
  
      // Clear out the values for the current history item. This will prevent the history item from clobbering the
      // value determined during page scale initialization, which may be less than 1.
      page()->deprecatedLocalMainFrame()->loader().clearScrollPositionAndViewState();
      m_pageScaleConstraintsSet.setNeedsReset(true);
  
      // Clobber saved scales and scroll offsets.
      if (FrameView* view = page()->deprecatedLocalMainFrame()->document()->view())
          view->cacheCurrentScrollPosition();
  }
  
  void WebViewImpl::performMediaPlayerAction(const WebMediaPlayerAction& action,
                                             const WebPoint& location)
  {
      HitTestResult result = hitTestResultForWindowPos(location);
      RefPtrWillBeRawPtr<Node> node = result.innerNonSharedNode();
      if (!isHTMLVideoElement(*node) && !isHTMLAudioElement(*node))
          return;
  
      RefPtrWillBeRawPtr<HTMLMediaElement> mediaElement = static_pointer_cast<HTMLMediaElement>(node);
      switch (action.type) {
      case WebMediaPlayerAction::Play:
          if (action.enable)
              mediaElement->play();
          else
              mediaElement->pause();
          break;
      case WebMediaPlayerAction::Mute:
          mediaElement->setMuted(action.enable);
          break;
      case WebMediaPlayerAction::Loop:
          mediaElement->setLoop(action.enable);
          break;
      case WebMediaPlayerAction::Controls:
          mediaElement->setBooleanAttribute(HTMLNames::controlsAttr, action.enable);
          break;
      default:
          ASSERT_NOT_REACHED();
      }
  }
  
  void WebViewImpl::performPluginAction(const WebPluginAction& action,
                                        const WebPoint& location)
  {
      HitTestResult result = hitTestResultForWindowPos(location);
      RefPtrWillBeRawPtr<Node> node = result.innerNonSharedNode();
      if (!isHTMLObjectElement(*node) && !isHTMLEmbedElement(*node))
          return;
  
      RenderObject* object = node->renderer();
      if (object && object->isRenderPart()) {
          Widget* widget = toRenderPart(object)->widget();
          if (widget && widget->isPluginContainer()) {
              WebPluginContainerImpl* plugin = toWebPluginContainerImpl(widget);
              switch (action.type) {
              case WebPluginAction::Rotate90Clockwise:
                  plugin->plugin()->rotateView(WebPlugin::RotationType90Clockwise);
                  break;
              case WebPluginAction::Rotate90Counterclockwise:
                  plugin->plugin()->rotateView(WebPlugin::RotationType90Counterclockwise);
                  break;
              default:
                  ASSERT_NOT_REACHED();
              }
          }
      }
  }
  
  WebHitTestResult WebViewImpl::hitTestResultAt(const WebPoint& point)
  {
      return coreHitTestResultAt(point);
  }
  
  HitTestResult WebViewImpl::coreHitTestResultAt(const WebPoint& point)
  {
      IntPoint scaledPoint = point;
      scaledPoint.scale(1 / pageScaleFactor(), 1 / pageScaleFactor());
      return hitTestResultForWindowPos(scaledPoint);
  }
  
  void WebViewImpl::copyImageAt(const WebPoint& point)
  {
      if (!m_page)
          return;
  
      HitTestResult result = hitTestResultForWindowPos(point);
      if (!isHTMLCanvasElement(result.innerNonSharedNode()) && result.absoluteImageURL().isEmpty()) {
          // There isn't actually an image at these coordinates.  Might be because
          // the window scrolled while the context menu was open or because the page
          // changed itself between when we thought there was an image here and when
          // we actually tried to retreive the image.
          //
          // FIXME: implement a cache of the most recent HitTestResult to avoid having
          //        to do two hit tests.
          return;
      }
  
      m_page->deprecatedLocalMainFrame()->editor().copyImage(result);
  }
  
  void WebViewImpl::saveImageAt(const WebPoint& point)
  {
      if (!m_client)
          return;
  
      Node* node = hitTestResultForWindowPos(point).innerNonSharedNode();
      if (!node || !(isHTMLCanvasElement(*node) || isHTMLImageElement(*node)))
          return;
  
      String url = toElement(*node).imageSourceURL();
      if (!KURL(KURL(), url).protocolIsData())
          return;
  
      m_client->saveImageFromDataURL(url);
  }
  
  void WebViewImpl::dragSourceEndedAt(
      const WebPoint& clientPoint,
      const WebPoint& screenPoint,
      WebDragOperation operation)
  {
      PlatformMouseEvent pme(clientPoint, screenPoint, LeftButton, PlatformEvent::MouseMoved,
          0, false, false, false, false, PlatformMouseEvent::RealOrIndistinguishable, 0);
      m_page->deprecatedLocalMainFrame()->eventHandler().dragSourceEndedAt(pme,
          static_cast<DragOperation>(operation));
  }
  
  void WebViewImpl::dragSourceSystemDragEnded()
  {
      // It's possible for us to get this callback while not doing a drag if
      // it's from a previous page that got unloaded.
      if (m_doingDragAndDrop) {
          m_page->dragController().dragEnded();
          m_doingDragAndDrop = false;
      }
  }
  
  WebDragOperation WebViewImpl::dragTargetDragEnter(
      const WebDragData& webDragData,
      const WebPoint& clientPoint,
      const WebPoint& screenPoint,
      WebDragOperationsMask operationsAllowed,
      int keyModifiers)
  {
      ASSERT(!m_currentDragData);
  
      m_currentDragData = webDragData.getValue();
      m_operationsAllowed = operationsAllowed;
  
      return dragTargetDragEnterOrOver(clientPoint, screenPoint, DragEnter, keyModifiers);
  }
  
  WebDragOperation WebViewImpl::dragTargetDragOver(
      const WebPoint& clientPoint,
      const WebPoint& screenPoint,
      WebDragOperationsMask operationsAllowed,
      int keyModifiers)
  {
      m_operationsAllowed = operationsAllowed;
  
      return dragTargetDragEnterOrOver(clientPoint, screenPoint, DragOver, keyModifiers);
  }
  
  void WebViewImpl::dragTargetDragLeave()
  {
      ASSERT(m_currentDragData);
  
      DragData dragData(
          m_currentDragData.get(),
          IntPoint(),
          IntPoint(),
          static_cast<DragOperation>(m_operationsAllowed));
  
      m_page->dragController().dragExited(&dragData);
  
      // FIXME: why is the drag scroll timer not stopped here?
  
      m_dragOperation = WebDragOperationNone;
      m_currentDragData = nullptr;
  }
  
  void WebViewImpl::dragTargetDrop(const WebPoint& clientPoint,
                                   const WebPoint& screenPoint,
                                   int keyModifiers)
  {
      ASSERT(m_currentDragData);
  
      WebAutofillClient* autofillClient = mainFrameImpl() ? mainFrameImpl()->autofillClient() : 0;
      UserGestureNotifier notifier(autofillClient, &m_userGestureObserved);
  
      // If this webview transitions from the "drop accepting" state to the "not
      // accepting" state, then our IPC message reply indicating that may be in-
      // flight, or else delayed by javascript processing in this webview.  If a
      // drop happens before our IPC reply has reached the browser process, then
      // the browser forwards the drop to this webview.  So only allow a drop to
      // proceed if our webview m_dragOperation state is not DragOperationNone.
  
      if (m_dragOperation == WebDragOperationNone) { // IPC RACE CONDITION: do not allow this drop.
          dragTargetDragLeave();
          return;
      }
  
      m_currentDragData->setModifierKeyState(webInputEventKeyStateToPlatformEventKeyState(keyModifiers));
      DragData dragData(
          m_currentDragData.get(),
          clientPoint,
          screenPoint,
          static_cast<DragOperation>(m_operationsAllowed));
  
      UserGestureIndicator gesture(DefinitelyProcessingNewUserGesture);
      m_page->dragController().performDrag(&dragData);
  
      m_dragOperation = WebDragOperationNone;
      m_currentDragData = nullptr;
  }
  
  void WebViewImpl::spellingMarkers(WebVector<uint32_t>* markers)
  {
      Vector<uint32_t> result;
      for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
          if (!frame->isLocalFrame())
              continue;
          const DocumentMarkerVector& documentMarkers = toLocalFrame(frame)->document()->markers().markers();
          for (size_t i = 0; i < documentMarkers.size(); ++i)
              result.append(documentMarkers[i]->hash());
      }
      markers->assign(result);
  }
  
  void WebViewImpl::removeSpellingMarkersUnderWords(const WebVector<WebString>& words)
  {
      Vector<String> convertedWords;
      convertedWords.append(words.data(), words.size());
  
      for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
          if (frame->isLocalFrame())
              toLocalFrame(frame)->removeSpellingMarkersUnderWords(convertedWords);
      }
  }
  
  WebDragOperation WebViewImpl::dragTargetDragEnterOrOver(const WebPoint& clientPoint, const WebPoint& screenPoint, DragAction dragAction, int keyModifiers)
  {
      ASSERT(m_currentDragData);
  
      m_currentDragData->setModifierKeyState(webInputEventKeyStateToPlatformEventKeyState(keyModifiers));
      DragData dragData(
          m_currentDragData.get(),
          clientPoint,
          screenPoint,
          static_cast<DragOperation>(m_operationsAllowed));
  
      DragSession dragSession;
      if (dragAction == DragEnter)
          dragSession = m_page->dragController().dragEntered(&dragData);
      else
          dragSession = m_page->dragController().dragUpdated(&dragData);
  
      DragOperation dropEffect = dragSession.operation;
  
      // Mask the drop effect operation against the drag source's allowed operations.
      if (!(dropEffect & dragData.draggingSourceOperationMask()))
          dropEffect = DragOperationNone;
  
       m_dragOperation = static_cast<WebDragOperation>(dropEffect);
  
      return m_dragOperation;
  }
  
  void WebViewImpl::sendResizeEventAndRepaint()
  {
      // FIXME: This is wrong. The FrameView is responsible sending a resizeEvent
      // as part of layout. Layout is also responsible for sending invalidations
      // to the embedder. This method and all callers may be wrong. -- eseidel.
      if (localFrameRootTemporary()->frameView()) {
          // Enqueues the resize event.
          localFrameRootTemporary()->frame()->document()->enqueueResizeEvent();
      }
  
      if (m_client) {
          if (isAcceleratedCompositingActive()) {
              updateLayerTreeViewport();
          } else {
              WebRect damagedRect(0, 0, m_size.width, m_size.height);
              m_client->didInvalidateRect(damagedRect);
          }
      }
      if (m_pageOverlays)
          m_pageOverlays->update();
  }
  
  void WebViewImpl::configureAutoResizeMode()
  {
      if (!mainFrameImpl() || !mainFrameImpl()->frame() || !mainFrameImpl()->frame()->view())
          return;
  
      if (m_shouldAutoResize)
          mainFrameImpl()->frame()->view()->enableAutoSizeMode(m_minAutoSize, m_maxAutoSize);
      else
          mainFrameImpl()->frame()->view()->disableAutoSizeMode();
  }
  
  unsigned long WebViewImpl::createUniqueIdentifierForRequest()
  {
      return createUniqueIdentifier();
  }
  
  void WebViewImpl::inspectElementAt(const WebPoint& point)
  {
      if (!m_page)
          return;
  
      if (point.x == -1 || point.y == -1) {
          m_page->inspectorController().inspect(0);
      } else {
          HitTestRequest::HitTestRequestType hitType = HitTestRequest::Move | HitTestRequest::ReadOnly | HitTestRequest::AllowChildFrameContent;
          HitTestRequest request(hitType);
  
          WebMouseEvent dummyEvent;
          dummyEvent.type = WebInputEvent::MouseDown;
          dummyEvent.x = point.x;
          dummyEvent.y = point.y;
          IntPoint transformedPoint = PlatformMouseEventBuilder(m_page->deprecatedLocalMainFrame()->view(), dummyEvent).position();
          HitTestResult result(m_page->deprecatedLocalMainFrame()->view()->windowToContents(transformedPoint));
          m_page->deprecatedLocalMainFrame()->contentRenderer()->hitTest(request, result);
          Node* node = result.innerNode();
          if (!node && m_page->deprecatedLocalMainFrame()->document())
              node = m_page->deprecatedLocalMainFrame()->document()->documentElement();
          m_page->inspectorController().inspect(node);
      }
  }
  
  void WebViewImpl::setCompositorDeviceScaleFactorOverride(float deviceScaleFactor)
  {
      if (m_compositorDeviceScaleFactorOverride == deviceScaleFactor)
          return;
      m_compositorDeviceScaleFactorOverride = deviceScaleFactor;
      if (page() && m_layerTreeView)
          updateLayerTreeDeviceScaleFactor();
  }
  
  void WebViewImpl::setRootLayerTransform(const WebSize& rootLayerOffset, float rootLayerScale)
  {
      if (m_rootLayerScale == rootLayerScale && m_rootLayerOffset == rootLayerOffset)
          return;
      m_rootLayerScale = rootLayerScale;
      m_rootLayerOffset = rootLayerOffset;
      if (mainFrameImpl())
          mainFrameImpl()->setInputEventsTransformForEmulation(m_rootLayerOffset, m_rootLayerScale);
      updateRootLayerTransform();
  }
  
  WebDevToolsAgent* WebViewImpl::devToolsAgent()
  {
      return m_devToolsAgent.get();
  }
  
  WebAXObject WebViewImpl::accessibilityObject()
  {
      if (!mainFrameImpl())
          return WebAXObject();
  
      Document* document = mainFrameImpl()->frame()->document();
      return WebAXObject(toAXObjectCacheImpl(document->axObjectCache())->root());
  }
  
  void WebViewImpl::performCustomContextMenuAction(unsigned action)
  {
      if (!m_page)
          return;
      ContextMenu* menu = m_page->contextMenuController().contextMenu();
      if (!menu)
          return;
      const ContextMenuItem* item = menu->itemWithAction(static_cast<ContextMenuAction>(ContextMenuItemBaseCustomTag + action));
      if (item)
          m_page->contextMenuController().contextMenuItemSelected(item);
      m_page->contextMenuController().clearContextMenu();
  }
  
  void WebViewImpl::showContextMenu()
  {
      if (!page())
          return;
  
      page()->contextMenuController().clearContextMenu();
      m_contextMenuAllowed = true;
      if (LocalFrame* focusedFrame = toLocalFrame(page()->focusController().focusedOrMainFrame()))
          focusedFrame->eventHandler().sendContextMenuEventForKey();
      m_contextMenuAllowed = false;
  }
  
  void WebViewImpl::extractSmartClipData(WebRect rect, WebString& clipText, WebString& clipHtml, WebRect& clipRect)
  {
      LocalFrame* localFrame = toLocalFrame(focusedCoreFrame());
      if (!localFrame)
          return;
      SmartClipData clipData = SmartClip(localFrame).dataForRect(rect);
      clipText = clipData.clipData();
      clipRect = clipData.rect();
  
      WebLocalFrameImpl* frame = mainFrameImpl();
      if (!frame)
          return;
      WebPoint startPoint(rect.x, rect.y);
      WebPoint endPoint(rect.x + rect.width, rect.y + rect.height);
      VisiblePosition startVisiblePosition = frame->visiblePositionForWindowPoint(startPoint);
      VisiblePosition endVisiblePosition = frame->visiblePositionForWindowPoint(endPoint);
  
      Position startPosition = startVisiblePosition.deepEquivalent();
      Position endPosition = endVisiblePosition.deepEquivalent();
  
      // document() will return null if -webkit-user-select is set to none.
      if (!startPosition.document() || !endPosition.document())
          return;
  
      RefPtrWillBeRawPtr<Range> range = Range::create(*startPosition.document(), startPosition, endPosition);
      if (!range)
          return;
  
      clipHtml = createMarkup(range.get(), AnnotateForInterchange, false, ResolveNonLocalURLs);
  }
  
  void WebViewImpl::hidePopups()
  {
      hideSelectPopup();
      if (m_pagePopup)
          closePagePopup(m_pagePopup.get());
  }
  
  void WebViewImpl::setIsTransparent(bool isTransparent)
  {
      // Set any existing frames to be transparent.
      Frame* frame = m_page->mainFrame();
      while (frame) {
          if (frame->isLocalFrame())
              toLocalFrame(frame)->view()->setTransparent(isTransparent);
          frame = frame->tree().traverseNext();
      }
  
      // Future frames check this to know whether to be transparent.
      m_isTransparent = isTransparent;
  }
  
  bool WebViewImpl::isTransparent() const
  {
      return m_isTransparent;
  }
  
  void WebViewImpl::setBaseBackgroundColor(WebColor color)
  {
      layout();
  
      if (m_baseBackgroundColor == color)
          return;
  
      m_baseBackgroundColor = color;
  
      if (m_page->mainFrame() && m_page->mainFrame()->isLocalFrame())
          m_page->deprecatedLocalMainFrame()->view()->setBaseBackgroundColor(color);
  
      updateLayerTreeBackgroundColor();
  }
  
  void WebViewImpl::setIsActive(bool active)
  {
      if (page())
          page()->focusController().setActive(active);
  }
  
  bool WebViewImpl::isActive() const
  {
      return page() ? page()->focusController().isActive() : false;
  }
  
  void WebViewImpl::setDomainRelaxationForbidden(bool forbidden, const WebString& scheme)
  {
      SchemeRegistry::setDomainRelaxationForbiddenForURLScheme(forbidden, String(scheme));
  }
  
  void WebViewImpl::setWindowFeatures(const WebWindowFeatures& features)
  {
      m_page->chrome().setWindowFeatures(features);
  }
  
  void WebViewImpl::setOpenedByDOM()
  {
      m_page->setOpenedByDOM();
  }
  
  void WebViewImpl::setSelectionColors(unsigned activeBackgroundColor,
                                       unsigned activeForegroundColor,
                                       unsigned inactiveBackgroundColor,
                                       unsigned inactiveForegroundColor) {
  #if USE(DEFAULT_RENDER_THEME)
      RenderThemeChromiumDefault::setSelectionColors(activeBackgroundColor, activeForegroundColor, inactiveBackgroundColor, inactiveForegroundColor);
      RenderTheme::theme().platformColorsDidChange();
  #endif
  }
  
  void WebView::injectStyleSheet(const WebString& sourceCode, const WebVector<WebString>& patternsIn, WebView::StyleInjectionTarget injectIn)
  {
      Vector<String> patterns;
      for (size_t i = 0; i < patternsIn.size(); ++i)
          patterns.append(patternsIn[i]);
  
      InjectedStyleSheets::instance().add(sourceCode, patterns, static_cast<blink::StyleInjectionTarget>(injectIn));
  }
  
  void WebView::removeInjectedStyleSheets()
  {
      InjectedStyleSheets::instance().removeAll();
  }
  
  void WebViewImpl::didCommitLoad(bool isNewNavigation, bool isNavigationWithinPage)
  {
      if (isNewNavigation && !isNavigationWithinPage)
          m_pageScaleConstraintsSet.setNeedsReset(true);
  
      // Give the pinch viewport's scroll layer its initial size.
      page()->frameHost().pinchViewport().mainFrameDidChangeSize();
  
      // Make sure link highlight from previous page is cleared.
      m_linkHighlights.clear();
      endActiveFlingAnimation();
      m_userGestureObserved = false;
  }
  
  void WebViewImpl::willInsertBody(WebLocalFrameImpl* webframe)
  {
      if (webframe != mainFrameImpl())
          return;
  
      if (!m_page->mainFrame()->isLocalFrame())
          return;
  
      // If we get to the <body> tag and we have no pending stylesheet and import load, we
      // can be fairly confident we'll have something sensible to paint soon and
      // can turn off deferred commits.
      if (m_page->deprecatedLocalMainFrame()->document()->isRenderingReady())
          resumeTreeViewCommits();
  }
  
  void WebViewImpl::didRemoveAllPendingStylesheet(WebLocalFrameImpl* webframe)
  {
      if (webframe != mainFrameImpl())
          return;
  
      // If we have no more stylesheets to load and we're past the body tag,
      // we should have something to paint and should start as soon as possible.
      if (m_page->deprecatedLocalMainFrame()->document()->body())
          resumeTreeViewCommits();
  }
  
  void WebViewImpl::resumeTreeViewCommits()
  {
      if (m_layerTreeViewCommitsDeferred) {
          if (m_layerTreeView)
              m_layerTreeView->setDeferCommits(false);
          m_layerTreeViewCommitsDeferred = false;
      }
  }
  
  void WebViewImpl::layoutUpdated(WebLocalFrameImpl* webframe)
  {
      if (!m_client || !webframe->frame()->isLocalRoot())
          return;
  
      // If we finished a layout while in deferred commit mode,
      // that means it's time to start producing frames again so un-defer.
      resumeTreeViewCommits();
  
      if (m_shouldAutoResize && webframe->frame() && webframe->frame()->view()) {
          WebSize frameSize = webframe->frame()->view()->frameRect().size();
          if (frameSize != m_size) {
              m_size = frameSize;
  
              page()->frameHost().pinchViewport().setSize(m_size);
              m_pageScaleConstraintsSet.didChangeViewSize(m_size);
  
              m_client->didAutoResize(m_size);
              sendResizeEventAndRepaint();
          }
      }
  
      if (m_pageScaleConstraintsSet.constraintsDirty())
          refreshPageScaleFactorAfterLayout();
  
      FrameView* view = webframe->frame()->view();
  
      if (pinchVirtualViewportEnabled())
          view->resize(mainFrameSize());
  
      // Relayout immediately to avoid violating the rule that needsLayout()
      // isn't set at the end of a layout.
      if (view->needsLayout())
          view->layout();
  
      // In case we didn't have a size when the top controls were updated.
      didUpdateTopControls();
  
      m_client->didUpdateLayout();
  }
  
  void WebViewImpl::didChangeContentsSize()
  {
      m_pageScaleConstraintsSet.didChangeContentsSize(contentsSize(), pageScaleFactor());
  }
  
  void WebViewImpl::deviceOrPageScaleFactorChanged()
  {
      m_pageScaleConstraintsSet.setNeedsReset(false);
      updateLayerTreeViewport();
      m_page->inspectorController().deviceOrPageScaleFactorChanged();
  }
  
  bool WebViewImpl::useExternalPopupMenus()
  {
      return shouldUseExternalPopupMenus;
  }
  
  void WebViewImpl::startDragging(LocalFrame* frame,
                                  const WebDragData& dragData,
                                  WebDragOperationsMask mask,
                                  const WebImage& dragImage,
                                  const WebPoint& dragImageOffset)
  {
      if (!m_client)
          return;
      ASSERT(!m_doingDragAndDrop);
      m_doingDragAndDrop = true;
      m_client->startDragging(WebLocalFrameImpl::fromFrame(frame), dragData, mask, dragImage, dragImageOffset);
  }
  
  void WebViewImpl::setIgnoreInputEvents(bool newValue)
  {
      ASSERT(m_ignoreInputEvents != newValue);
      m_ignoreInputEvents = newValue;
  }
  
  void WebViewImpl::setBackgroundColorOverride(WebColor color)
  {
      m_backgroundColorOverride = color;
      updateLayerTreeBackgroundColor();
  }
  
  void WebViewImpl::setZoomFactorOverride(float zoomFactor)
  {
      m_zoomFactorOverride = zoomFactor;
      setZoomLevel(zoomLevel());
  }
  
  void WebViewImpl::addPageOverlay(WebPageOverlay* overlay, int zOrder)
  {
      if (!m_pageOverlays)
          m_pageOverlays = PageOverlayList::create(this);
  
      m_pageOverlays->add(overlay, zOrder);
  }
  
  void WebViewImpl::removePageOverlay(WebPageOverlay* overlay)
  {
      if (m_pageOverlays && m_pageOverlays->remove(overlay) && m_pageOverlays->empty())
          m_pageOverlays = nullptr;
  }
  
  void WebViewImpl::setOverlayLayer(GraphicsLayer* layer)
  {
      if (!m_rootGraphicsLayer)
          return;
  
      if (!m_page->mainFrame()->isLocalFrame())
          return;
  
      if (pinchVirtualViewportEnabled()) {
          m_page->deprecatedLocalMainFrame()->view()->renderView()->compositor()->setOverlayLayer(layer);
          return;
      }
  
      // FIXME(bokan): This path goes away after virtual viewport pinch is enabled everywhere.
      if (!m_rootTransformLayer)
          m_rootTransformLayer = m_page->deprecatedLocalMainFrame()->view()->renderView()->compositor()->ensureRootTransformLayer();
  
      if (m_rootTransformLayer) {
          if (layer->parent() != m_rootTransformLayer)
              m_rootTransformLayer->addChild(layer);
      }
  }
  
  Element* WebViewImpl::focusedElement() const
  {
      Frame* frame = m_page->focusController().focusedFrame();
      if (!frame || !frame->isLocalFrame())
          return 0;
  
      Document* document = toLocalFrame(frame)->document();
      if (!document)
          return 0;
  
      return document->focusedElement();
  }
  
  HitTestResult WebViewImpl::hitTestResultForWindowPos(const IntPoint& pos)
  {
      if (!m_page->mainFrame()->isLocalFrame())
          return HitTestResult();
      IntPoint docPoint(m_page->deprecatedLocalMainFrame()->view()->windowToContents(pos));
      HitTestResult result = m_page->deprecatedLocalMainFrame()->eventHandler().hitTestResultAtPoint(docPoint, HitTestRequest::ReadOnly | HitTestRequest::Active);
      result.setToShadowHostIfInUserAgentShadowRoot();
      return result;
  }
  
  WebHitTestResult WebViewImpl::hitTestResultForTap(const WebPoint& tapPointWindowPos, const WebSize& tapArea)
  {
      if (!m_page->mainFrame()->isLocalFrame())
          return HitTestResult();
  
      WebGestureEvent tapEvent;
      tapEvent.x = tapPointWindowPos.x;
      tapEvent.y = tapPointWindowPos.y;
      tapEvent.type = WebInputEvent::GestureTap;
      tapEvent.data.tap.tapCount = 1;
      tapEvent.data.tap.width = tapArea.width;
      tapEvent.data.tap.height = tapArea.height;
  
      PlatformGestureEventBuilder platformEvent(mainFrameImpl()->frameView(), tapEvent);
  
      HitTestResult result = m_page->deprecatedLocalMainFrame()->eventHandler().hitTestResultForGestureEvent(platformEvent, HitTestRequest::ReadOnly | HitTestRequest::Active).hitTestResult();
  
      result.setToShadowHostIfInUserAgentShadowRoot();
      return result;
  }
  
  void WebViewImpl::setTabsToLinks(bool enable)
  {
      m_tabsToLinks = enable;
  }
  
  bool WebViewImpl::tabsToLinks() const
  {
      return m_tabsToLinks;
  }
  
  void WebViewImpl::suppressInvalidations(bool enable)
  {
      if (m_client)
          m_client->suppressCompositorScheduling(enable);
  }
  
  void WebViewImpl::setRootGraphicsLayer(GraphicsLayer* layer)
  {
      suppressInvalidations(true);
  
      if (pinchVirtualViewportEnabled()) {
          PinchViewport& pinchViewport = page()->frameHost().pinchViewport();
          pinchViewport.attachToLayerTree(layer, graphicsLayerFactory());
          if (layer) {
              m_rootGraphicsLayer = pinchViewport.rootGraphicsLayer();
              m_rootLayer = pinchViewport.rootGraphicsLayer()->platformLayer();
              m_rootTransformLayer = pinchViewport.rootGraphicsLayer();
          } else {
              m_rootGraphicsLayer = nullptr;
              m_rootLayer = nullptr;
              m_rootTransformLayer = nullptr;
          }
      } else {
          m_rootGraphicsLayer = layer;
          m_rootLayer = layer ? layer->platformLayer() : 0;
          m_rootTransformLayer = nullptr;
      }
  
      setIsAcceleratedCompositingActive(layer != 0);
  
      updateRootLayerTransform();
  
      if (m_layerTreeView) {
          if (m_rootLayer) {
              m_layerTreeView->setRootLayer(*m_rootLayer);
              // We register viewport layers here since there may not be a layer
              // tree view prior to this point.
              if (pinchVirtualViewportEnabled()) {
                  page()->frameHost().pinchViewport().registerLayersWithTreeView(m_layerTreeView);
              } else {
                  GraphicsLayer* rootScrollLayer = compositor()->scrollLayer();
                  ASSERT(rootScrollLayer);
                  WebLayer* pageScaleLayer = rootScrollLayer->parent() ? rootScrollLayer->parent()->platformLayer() : nullptr;
                  // Note that it is invalid to have 0 as a scroll elasticity layer when using pinch virtual viewport.
                  m_layerTreeView->registerViewportLayers(0, pageScaleLayer, rootScrollLayer->platformLayer(), 0);
              }
          } else {
              m_layerTreeView->clearRootLayer();
              if (pinchVirtualViewportEnabled())
                  page()->frameHost().pinchViewport().clearLayersForTreeView(m_layerTreeView);
              else
                  m_layerTreeView->clearViewportLayers();
          }
      }
  
      suppressInvalidations(false);
  }
  
  void WebViewImpl::scheduleCompositingLayerSync()
  {
      m_layerTreeView->setNeedsAnimate();
  }
  
  void WebViewImpl::invalidateRect(const IntRect& rect)
  {
      if (m_isAcceleratedCompositingActive) {
          ASSERT(m_layerTreeView);
          updateLayerTreeViewport();
      } else if (m_client)
          m_client->didInvalidateRect(rect);
  }
  
  GraphicsLayerFactory* WebViewImpl::graphicsLayerFactory() const
  {
      return m_graphicsLayerFactory.get();
  }
  
  RenderLayerCompositor* WebViewImpl::compositor() const
  {
      if (!page() || !page()->mainFrame())
          return 0;
  
      if (!page()->mainFrame()->isLocalFrame())
          return localFrameRootTemporary()->frame()->document()->renderView()->compositor();
  
      if (!page()->deprecatedLocalMainFrame()->document() || !page()->deprecatedLocalMainFrame()->document()->renderView())
          return 0;
  
      return page()->deprecatedLocalMainFrame()->document()->renderView()->compositor();
  }
  
  void WebViewImpl::registerForAnimations(WebLayer* layer)
  {
      if (m_layerTreeView)
          m_layerTreeView->registerForAnimations(layer);
  }
  
  GraphicsLayer* WebViewImpl::rootGraphicsLayer()
  {
      return m_rootGraphicsLayer;
  }
  
  void WebViewImpl::scheduleAnimation()
  {
      if (m_layerTreeView) {
          m_layerTreeView->setNeedsAnimate();
          return;
      }
      if (m_client)
          m_client->scheduleAnimation();
  }
  
  void WebViewImpl::initializeLayerTreeView()
  {
      if (m_client) {
          m_client->initializeLayerTreeView();
          m_layerTreeView = m_client->layerTreeView();
      }
  
      m_page->settings().setAcceleratedCompositingEnabled(m_layerTreeView != 0);
  
      // FIXME: only unittests, click to play, Android priting, and printing (for headers and footers)
      // make this assert necessary. We should make them not hit this code and then delete allowsBrokenNullLayerTreeView.
      ASSERT(m_layerTreeView || !m_client || m_client->allowsBrokenNullLayerTreeView());
  }
  
  void WebViewImpl::setIsAcceleratedCompositingActive(bool active)
  {
      // In the middle of shutting down; don't try to spin back up a compositor.
      // FIXME: compositing startup/shutdown should be refactored so that it
      // turns on explicitly rather than lazily, which causes this awkwardness.
      if (m_layerTreeViewClosed)
          return;
  
      ASSERT(!active || m_layerTreeView);
      Platform::current()->histogramEnumeration("GPU.setIsAcceleratedCompositingActive", active * 2 + m_isAcceleratedCompositingActive, 4);
  
      if (m_isAcceleratedCompositingActive == active)
          return;
  
      if (!m_client)
          return;
  
      if (!active) {
          m_isAcceleratedCompositingActive = false;
          if (!m_layerTreeViewCommitsDeferred) {
              ASSERT(m_layerTreeView);
              // This means that we're transitioning to a new page. Suppress commits until WebKit generates invalidations so
              // we don't attempt to paint too early in the next page load.
              m_layerTreeView->setDeferCommits(true);
              m_layerTreeViewCommitsDeferred = true;
          }
      } else {
          TRACE_EVENT0("blink", "WebViewImpl::setIsAcceleratedCompositingActive(true)");
          m_layerTreeView->setRootLayer(*m_rootLayer);
  
          bool visible = page()->visibilityState() == PageVisibilityStateVisible;
          m_layerTreeView->setVisible(visible);
          updateLayerTreeDeviceScaleFactor();
          m_layerTreeView->setPageScaleFactorAndLimits(pageScaleFactor(), minimumPageScaleFactor(), maximumPageScaleFactor());
          updateLayerTreeBackgroundColor();
          m_layerTreeView->setHasTransparentBackground(isTransparent());
          updateLayerTreeViewport();
          m_isAcceleratedCompositingActive = true;
          if (m_pageOverlays)
              m_pageOverlays->update();
          m_layerTreeView->setShowFPSCounter(m_showFPSCounter);
          m_layerTreeView->setShowPaintRects(m_showPaintRects);
          m_layerTreeView->setShowDebugBorders(m_showDebugBorders);
          m_layerTreeView->setContinuousPaintingEnabled(m_continuousPaintingEnabled);
          m_layerTreeView->setShowScrollBottleneckRects(m_showScrollBottleneckRects);
          m_layerTreeView->heuristicsForGpuRasterizationUpdated(m_matchesHeuristicsForGpuRasterization);
      }
      if (page() && page()->mainFrame()->isLocalFrame())
          page()->deprecatedLocalMainFrame()->view()->setClipsRepaints(!m_isAcceleratedCompositingActive);
  }
  
  void WebViewImpl::updateMainFrameScrollPosition(const IntPoint& scrollPosition, bool programmaticScroll)
  {
      if (!page()->mainFrame()->isLocalFrame())
          return;
  
      // FIXME(305811): Refactor for OOPI.
      FrameView* frameView = page()->deprecatedLocalMainFrame()->view();
      if (!frameView)
          return;
  
      if (frameView->scrollPosition() == scrollPosition)
          return;
  
      bool oldProgrammaticScroll = frameView->inProgrammaticScroll();
      frameView->setInProgrammaticScroll(programmaticScroll);
      frameView->notifyScrollPositionChanged(scrollPosition);
      frameView->setInProgrammaticScroll(oldProgrammaticScroll);
  }
  
  void WebViewImpl::updateRootLayerScrollPosition(const IntPoint& scrollPosition)
  {
      if (!page()->mainFrame()->isLocalFrame())
          return;
  
      // FIXME(305811): Refactor for OOPI.
      FrameView* frameView = page()->deprecatedLocalMainFrame()->view();
      if (!frameView)
          return;
  
      ScrollableArea* scrollableArea = frameView->renderView()->layer()->scrollableArea();
      if (scrollableArea->scrollPosition() == scrollPosition)
          return;
      scrollableArea->notifyScrollPositionChanged(scrollPosition);
  }
  
  void WebViewImpl::applyViewportDeltas(
      const WebSize& pinchViewportDelta,
      const WebSize& outerViewportDelta,
      const WebFloatSize& elasticOverscrollDelta,
      float pageScaleDelta,
      float topControlsDelta)
  {
      ASSERT(pinchVirtualViewportEnabled());
  
      if (!mainFrameImpl())
          return;
      FrameView* frameView = mainFrameImpl()->frameView();
      if (!frameView)
          return;
  
      setTopControlsContentOffset(m_topControlsContentOffset + topControlsDelta);
  
      FloatPoint pinchViewportOffset = page()->frameHost().pinchViewport().visibleRect().location();
      pinchViewportOffset.move(pinchViewportDelta.width, pinchViewportDelta.height);
      setPageScaleFactorAndLocation(pageScaleFactor() * pageScaleDelta, pinchViewportOffset);
  
      if (pageScaleDelta != 1)
          m_doubleTapZoomPending = false;
  
      frameView->setElasticOverscroll(elasticOverscrollDelta + frameView->elasticOverscroll());
  
      bool rootLayerScrolls = page()->settings().rootLayerScrolls();
      ScrollableArea* outerViewport;
      if (rootLayerScrolls)
          outerViewport = frameView->renderView()->layer()->scrollableArea();
      else
          outerViewport = frameView;
  
      IntPoint outerViewportOffset = outerViewport->scrollPosition();
      outerViewportOffset.move(outerViewportDelta.width, outerViewportDelta.height);
      if (rootLayerScrolls)
          updateRootLayerScrollPosition(outerViewportOffset);
      else
          updateMainFrameScrollPosition(outerViewportOffset, false);
  }
  
  void WebViewImpl::applyViewportDeltas(const WebSize& scrollDelta, float pageScaleDelta, float topControlsDelta)
  {
      if (!mainFrameImpl() || !mainFrameImpl()->frameView())
          return;
  
      setTopControlsContentOffset(m_topControlsContentOffset + topControlsDelta);
  
      if (pageScaleDelta == 1) {
          TRACE_EVENT_INSTANT2("blink", "WebViewImpl::applyScrollAndScale::scrollBy", "x", scrollDelta.width, "y", scrollDelta.height);
          WebSize webScrollOffset = mainFrame()->scrollOffset();
          IntPoint scrollOffset(webScrollOffset.width + scrollDelta.width, webScrollOffset.height + scrollDelta.height);
          updateMainFrameScrollPosition(scrollOffset, false);
      } else {
          // The page scale changed, so apply a scale and scroll in a single
          // operation.
          WebSize scrollOffset = mainFrame()->scrollOffset();
          scrollOffset.width += scrollDelta.width;
          scrollOffset.height += scrollDelta.height;
  
          WebPoint scrollPoint(scrollOffset.width, scrollOffset.height);
          setPageScaleFactor(pageScaleFactor() * pageScaleDelta, scrollPoint);
          m_doubleTapZoomPending = false;
      }
  }
  
  void WebViewImpl::updateLayerTreeViewport()
  {
      if (!page() || !m_layerTreeView)
          return;
  
      m_layerTreeView->setPageScaleFactorAndLimits(pageScaleFactor(), minimumPageScaleFactor(), maximumPageScaleFactor());
  }
  
  void WebViewImpl::updateLayerTreeBackgroundColor()
  {
      if (!m_layerTreeView)
          return;
  
      m_layerTreeView->setBackgroundColor(alphaChannel(m_backgroundColorOverride) ? m_backgroundColorOverride : backgroundColor());
  }
  
  void WebViewImpl::updateLayerTreeDeviceScaleFactor()
  {
      ASSERT(page());
      ASSERT(m_layerTreeView);
  
      float deviceScaleFactor = m_compositorDeviceScaleFactorOverride ? m_compositorDeviceScaleFactorOverride : page()->deviceScaleFactor();
      m_layerTreeView->setDeviceScaleFactor(deviceScaleFactor);
  }
  
  void WebViewImpl::updateRootLayerTransform()
  {
      // If we don't have a root graphics layer, we won't bother trying to find
      // or update the transform layer.
      if (!m_rootGraphicsLayer)
          return;
  
      // FIXME(bokan): m_rootTransformLayer is always set here in pinch virtual viewport. This can go away once
      // that's default everywhere.
      if (!m_rootTransformLayer && m_page->mainFrame()->isLocalFrame())
          m_rootTransformLayer = m_page->deprecatedLocalMainFrame()->view()->renderView()->compositor()->ensureRootTransformLayer();
  
      if (m_rootTransformLayer) {
          TransformationMatrix transform;
          transform.translate(m_rootLayerOffset.width, m_rootLayerOffset.height);
          transform = transform.scale(m_rootLayerScale);
          m_rootTransformLayer->setTransform(transform);
      }
  }
  
  bool WebViewImpl::detectContentOnTouch(const GestureEventWithHitTestResults& targetedEvent)
  {
      if (!m_page->mainFrame()->isLocalFrame())
          return false;
  
      // Need a local copy of the hit test as setToShadowHostIfInUserAgentShadowRoot() will modify it.
      HitTestResult touchHit = targetedEvent.hitTestResult();
      touchHit.setToShadowHostIfInUserAgentShadowRoot();
  
      if (touchHit.isContentEditable())
          return false;
  
      Node* node = touchHit.innerNode();
      if (!node || !node->isTextNode())
          return false;
  
      // Ignore when tapping on links or nodes listening to click events, unless the click event is on the
      // body element, in which case it's unlikely that the original node itself was intended to be clickable.
      for (; node && !isHTMLBodyElement(*node); node = NodeRenderingTraversal::parent(*node)) {
          if (node->isLink() || node->willRespondToTouchEvents() || node->willRespondToMouseClickEvents())
              return false;
      }
  
      WebContentDetectionResult content = m_client->detectContentAround(touchHit);
      if (!content.isValid())
          return false;
  
      m_client->scheduleContentIntent(content.intent());
      return true;
  }
  
  void WebViewImpl::setVisibilityState(WebPageVisibilityState visibilityState,
                                       bool isInitialState) {
      if (!page())
          return;
  
      ASSERT(visibilityState == WebPageVisibilityStateVisible || visibilityState == WebPageVisibilityStateHidden || visibilityState == WebPageVisibilityStatePrerender);
      m_page->setVisibilityState(static_cast<PageVisibilityState>(static_cast<int>(visibilityState)), isInitialState);
  
      if (m_layerTreeView) {
          bool visible = visibilityState == WebPageVisibilityStateVisible;
          m_layerTreeView->setVisible(visible);
      }
  }
  
  bool WebViewImpl::requestPointerLock()
  {
      return m_client && m_client->requestPointerLock();
  }
  
  void WebViewImpl::requestPointerUnlock()
  {
      if (m_client)
          m_client->requestPointerUnlock();
  }
  
  bool WebViewImpl::isPointerLocked()
  {
      return m_client && m_client->isPointerLocked();
  }
  
  void WebViewImpl::pointerLockMouseEvent(const WebInputEvent& event)
  {
      OwnPtr<UserGestureIndicator> gestureIndicator;
      AtomicString eventType;
      switch (event.type) {
      case WebInputEvent::MouseDown:
          eventType = EventTypeNames::mousedown;
          gestureIndicator = adoptPtr(new UserGestureIndicator(DefinitelyProcessingNewUserGesture));
          m_pointerLockGestureToken = gestureIndicator->currentToken();
          break;
      case WebInputEvent::MouseUp:
          eventType = EventTypeNames::mouseup;
          gestureIndicator = adoptPtr(new UserGestureIndicator(m_pointerLockGestureToken.release()));
          break;
      case WebInputEvent::MouseMove:
          eventType = EventTypeNames::mousemove;
          break;
      default:
          ASSERT_NOT_REACHED();
      }
  
      const WebMouseEvent& mouseEvent = static_cast<const WebMouseEvent&>(event);
  
      if (page())
          page()->pointerLockController().dispatchLockedMouseEvent(
              PlatformMouseEventBuilder(mainFrameImpl()->frameView(), mouseEvent),
              eventType);
  }
  
  bool WebViewImpl::shouldDisableDesktopWorkarounds()
  {
      if (!settings()->viewportEnabled())
          return false;
  
      // A document is considered adapted to small screen UAs if one of these holds:
      // 1. The author specified viewport has a constrained width that is equal to
      //    the initial viewport width.
      // 2. The author has disabled viewport zoom.
  
      const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
  
      if (!mainFrameImpl() || !mainFrameImpl()->frameView())
          return false;
  
      return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
          || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
  }
  
  void WebViewImpl::forceNextWebGLContextCreationToFail()
  {
      WebGLRenderingContext::forceNextWebGLContextCreationToFail();
  }
  
  } // namespace blink
  