text: // Copyright 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "chrome/browser/ui/browser.h"
  
  #if defined(OS_WIN)
  #include <windows.h>
  #include <shellapi.h>
  #endif  // defined(OS_WIN)
  
  #include <algorithm>
  #include <string>
  
  #include "base/base_paths.h"
  #include "base/bind.h"
  #include "base/command_line.h"
  #include "base/logging.h"
  #include "base/metrics/histogram.h"
  #include "base/path_service.h"
  #include "base/prefs/pref_service.h"
  #include "base/process_info.h"
  #include "base/strings/string_number_conversions.h"
  #include "base/strings/string_util.h"
  #include "base/strings/stringprintf.h"
  #include "base/strings/utf_string_conversions.h"
  #include "base/threading/thread.h"
  #include "base/threading/thread_restrictions.h"
  #include "base/time.h"
  #include "chrome/app/chrome_command_ids.h"
  #include "chrome/browser/app_mode/app_mode_utils.h"
  #include "chrome/browser/autofill/personal_data_manager_factory.h"
  #include "chrome/browser/background/background_contents_service.h"
  #include "chrome/browser/background/background_contents_service_factory.h"
  #include "chrome/browser/bookmarks/bookmark_model.h"
  #include "chrome/browser/bookmarks/bookmark_utils.h"
  #include "chrome/browser/browser_process.h"
  #include "chrome/browser/browser_shutdown.h"
  #include "chrome/browser/character_encoding.h"
  #include "chrome/browser/chrome_page_zoom.h"
  #include "chrome/browser/content_settings/host_content_settings_map.h"
  #include "chrome/browser/content_settings/tab_specific_content_settings.h"
  #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
  #include "chrome/browser/custom_handlers/protocol_handler_registry_factory.h"
  #include "chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.h"
  #include "chrome/browser/devtools/devtools_toggle_action.h"
  #include "chrome/browser/devtools/devtools_window.h"
  #include "chrome/browser/download/download_item_model.h"
  #include "chrome/browser/download/download_service.h"
  #include "chrome/browser/download/download_service_factory.h"
  #include "chrome/browser/download/download_shelf.h"
  #include "chrome/browser/extensions/browser_extension_window_controller.h"
  #include "chrome/browser/extensions/extension_prefs.h"
  #include "chrome/browser/extensions/extension_service.h"
  #include "chrome/browser/extensions/extension_system.h"
  #include "chrome/browser/extensions/tab_helper.h"
  #include "chrome/browser/favicon/favicon_tab_helper.h"
  #include "chrome/browser/file_select_helper.h"
  #include "chrome/browser/first_run/first_run.h"
  #include "chrome/browser/google/google_url_tracker.h"
  #include "chrome/browser/infobars/infobar_service.h"
  #include "chrome/browser/infobars/simple_alert_infobar_delegate.h"
  #include "chrome/browser/lifetime/application_lifetime.h"
  #include "chrome/browser/media/media_capture_devices_dispatcher.h"
  #include "chrome/browser/net/url_fixer_upper.h"
  #include "chrome/browser/notifications/notification_ui_manager.h"
  #include "chrome/browser/pepper_broker_infobar_delegate.h"
  #include "chrome/browser/prefs/incognito_mode_prefs.h"
  #include "chrome/browser/printing/cloud_print/cloud_print_setup_flow.h"
  #include "chrome/browser/profiles/profile.h"
  #include "chrome/browser/profiles/profile_destroyer.h"
  #include "chrome/browser/profiles/profile_manager.h"
  #include "chrome/browser/profiles/profile_metrics.h"
  #include "chrome/browser/repost_form_warning_controller.h"
  #include "chrome/browser/search/search.h"
  #include "chrome/browser/sessions/session_service.h"
  #include "chrome/browser/sessions/session_service_factory.h"
  #include "chrome/browser/sessions/session_tab_helper.h"
  #include "chrome/browser/sessions/session_types.h"
  #include "chrome/browser/sessions/tab_restore_service.h"
  #include "chrome/browser/sessions/tab_restore_service_factory.h"
  #include "chrome/browser/sync/profile_sync_service.h"
  #include "chrome/browser/sync/profile_sync_service_factory.h"
  #include "chrome/browser/sync/sync_ui_util.h"
  #include "chrome/browser/tab_contents/background_contents.h"
  #include "chrome/browser/tab_contents/retargeting_details.h"
  #include "chrome/browser/tab_contents/tab_util.h"
  #include "chrome/browser/themes/theme_service.h"
  #include "chrome/browser/themes/theme_service_factory.h"
  #include "chrome/browser/ui/app_modal_dialogs/javascript_dialog_manager.h"
  #include "chrome/browser/ui/blocked_content/blocked_content_tab_helper.h"
  #include "chrome/browser/ui/bookmarks/bookmark_tab_helper.h"
  #include "chrome/browser/ui/browser_command_controller.h"
  #include "chrome/browser/ui/browser_commands.h"
  #include "chrome/browser/ui/browser_content_setting_bubble_model_delegate.h"
  #include "chrome/browser/ui/browser_dialogs.h"
  #include "chrome/browser/ui/browser_finder.h"
  #include "chrome/browser/ui/browser_instant_controller.h"
  #include "chrome/browser/ui/browser_iterator.h"
  #include "chrome/browser/ui/browser_list.h"
  #include "chrome/browser/ui/browser_navigator.h"
  #include "chrome/browser/ui/browser_tab_contents.h"
  #include "chrome/browser/ui/browser_tab_restore_service_delegate.h"
  #include "chrome/browser/ui/browser_tab_strip_model_delegate.h"
  #include "chrome/browser/ui/browser_tabstrip.h"
  #include "chrome/browser/ui/browser_toolbar_model_delegate.h"
  #include "chrome/browser/ui/browser_ui_prefs.h"
  #include "chrome/browser/ui/browser_window.h"
  #include "chrome/browser/ui/chrome_pages.h"
  #include "chrome/browser/ui/chrome_select_file_policy.h"
  #include "chrome/browser/ui/extensions/shell_window.h"
  #include "chrome/browser/ui/find_bar/find_bar.h"
  #include "chrome/browser/ui/find_bar/find_bar_controller.h"
  #include "chrome/browser/ui/find_bar/find_tab_helper.h"
  #include "chrome/browser/ui/fullscreen/fullscreen_controller.h"
  #include "chrome/browser/ui/global_error/global_error.h"
  #include "chrome/browser/ui/global_error/global_error_service.h"
  #include "chrome/browser/ui/global_error/global_error_service_factory.h"
  #include "chrome/browser/ui/omnibox/location_bar.h"
  #include "chrome/browser/ui/search/search_delegate.h"
  #include "chrome/browser/ui/search/search_model.h"
  #include "chrome/browser/ui/search_engines/search_engine_tab_helper.h"
  #include "chrome/browser/ui/singleton_tabs.h"
  #include "chrome/browser/ui/status_bubble.h"
  #include "chrome/browser/ui/sync/browser_synced_window_delegate.h"
  #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
  #include "chrome/browser/ui/tab_modal_confirm_dialog.h"
  #include "chrome/browser/ui/tabs/dock_info.h"
  #include "chrome/browser/ui/tabs/tab_menu_model.h"
  #include "chrome/browser/ui/tabs/tab_strip_model.h"
  #include "chrome/browser/ui/toolbar/toolbar_model_impl.h"
  #include "chrome/browser/ui/unload_controller.h"
  #include "chrome/browser/ui/web_applications/web_app_ui.h"
  #include "chrome/browser/ui/webui/signin/login_ui_service.h"
  #include "chrome/browser/ui/webui/signin/login_ui_service_factory.h"
  #include "chrome/browser/ui/window_sizer/window_sizer.h"
  #include "chrome/browser/ui/zoom/zoom_controller.h"
  #include "chrome/browser/upgrade_detector.h"
  #include "chrome/browser/web_applications/web_app.h"
  #include "chrome/common/chrome_constants.h"
  #include "chrome/common/chrome_notification_types.h"
  #include "chrome/common/chrome_switches.h"
  #include "chrome/common/custom_handlers/protocol_handler.h"
  #include "chrome/common/extensions/background_info.h"
  #include "chrome/common/extensions/extension.h"
  #include "chrome/common/extensions/extension_constants.h"
  #include "chrome/common/pref_names.h"
  #include "chrome/common/profiling.h"
  #include "chrome/common/search_types.h"
  #include "chrome/common/startup_metric_utils.h"
  #include "chrome/common/url_constants.h"
  #include "components/web_modal/web_contents_modal_dialog_manager.h"
  #include "content/public/browser/devtools_manager.h"
  #include "content/public/browser/download_item.h"
  #include "content/public/browser/download_manager.h"
  #include "content/public/browser/interstitial_page.h"
  #include "content/public/browser/invalidate_type.h"
  #include "content/public/browser/navigation_controller.h"
  #include "content/public/browser/navigation_entry.h"
  #include "content/public/browser/notification_details.h"
  #include "content/public/browser/notification_service.h"
  #include "content/public/browser/plugin_service.h"
  #include "content/public/browser/render_process_host.h"
  #include "content/public/browser/render_view_host.h"
  #include "content/public/browser/site_instance.h"
  #include "content/public/browser/user_metrics.h"
  #include "content/public/browser/web_contents.h"
  #include "content/public/browser/web_contents_view.h"
  #include "content/public/common/content_restriction.h"
  #include "content/public/common/content_switches.h"
  #include "content/public/common/page_zoom.h"
  #include "content/public/common/renderer_preferences.h"
  #include "extensions/common/constants.h"
  #include "grit/chromium_strings.h"
  #include "grit/generated_resources.h"
  #include "grit/locale_settings.h"
  #include "grit/theme_resources.h"
  #include "net/base/net_util.h"
  #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
  #include "net/cookies/cookie_monster.h"
  #include "net/url_request/url_request_context.h"
  #include "ui/base/l10n/l10n_util.h"
  #include "ui/base/window_open_disposition.h"
  #include "ui/gfx/point.h"
  #include "ui/shell_dialogs/selected_file_info.h"
  #include "webkit/glue/webkit_glue.h"
  #include "webkit/plugins/webplugininfo.h"
  
  #if defined(OS_WIN)
  #include "base/win/metro.h"
  #include "chrome/browser/shell_integration.h"
  #include "chrome/browser/ssl/ssl_error_info.h"
  #include "chrome/browser/task_manager/task_manager.h"
  #include "chrome/browser/ui/view_ids.h"
  #include "components/autofill/browser/autofill_ie_toolbar_import_win.h"
  #include "ui/base/win/shell.h"
  #include "ui/views/win/hwnd_util.h"
  #endif  // OS_WIN
  
  #if defined(OS_CHROMEOS)
  #include "chrome/browser/chromeos/drive/file_system_util.h"
  #endif
  
  #if defined(USE_ASH)
  #include "ash/ash_switches.h"
  #endif
  
  using base::TimeDelta;
  using content::NativeWebKeyboardEvent;
  using content::NavigationController;
  using content::NavigationEntry;
  using content::OpenURLParams;
  using content::PluginService;
  using content::Referrer;
  using content::SiteInstance;
  using content::UserMetricsAction;
  using content::WebContents;
  using extensions::Extension;
  using ui::WebDialogDelegate;
  using web_modal::WebContentsModalDialogManager;
  
  ///////////////////////////////////////////////////////////////////////////////
  
  namespace {
  
  // The URL to be loaded to display the "Report a broken page" form.
  const char kBrokenPageUrl[] =
      "https://www.google.com/support/chrome/bin/request.py?contact_type="
      "broken_website&format=inproduct&p.page_title=$1&p.page_url=$2";
  
  // How long we wait before updating the browser chrome while loading a page.
  const int kUIUpdateCoalescingTimeMS = 200;
  
  BrowserWindow* CreateBrowserWindow(Browser* browser) {
    return BrowserWindow::CreateBrowserWindow(browser);
  }
  
  }  // namespace
  
  ////////////////////////////////////////////////////////////////////////////////
  // Browser, CreateParams:
  
  Browser::CreateParams::CreateParams(Profile* profile,
                                      chrome::HostDesktopType host_desktop_type)
      : type(TYPE_TABBED),
        profile(profile),
        host_desktop_type(host_desktop_type),
        app_type(APP_TYPE_HOST),
        initial_show_state(ui::SHOW_STATE_DEFAULT),
        is_session_restore(false),
        window(NULL) {
  }
  
  Browser::CreateParams::CreateParams(Type type,
                                      Profile* profile,
                                      chrome::HostDesktopType host_desktop_type)
      : type(type),
        profile(profile),
        host_desktop_type(host_desktop_type),
        app_type(APP_TYPE_HOST),
        initial_show_state(ui::SHOW_STATE_DEFAULT),
        is_session_restore(false),
        window(NULL) {
  }
  
  // static
  Browser::CreateParams Browser::CreateParams::CreateForApp(
      Type type,
      const std::string& app_name,
      const gfx::Rect& window_bounds,
      Profile* profile,
      chrome::HostDesktopType host_desktop_type) {
    DCHECK(type != TYPE_TABBED);
    DCHECK(!app_name.empty());
  
    CreateParams params(type, profile, host_desktop_type);
    params.app_name = app_name;
    params.app_type = APP_TYPE_CHILD;
    params.initial_bounds = window_bounds;
  
    return params;
  }
  
  // static
  Browser::CreateParams Browser::CreateParams::CreateForDevTools(
      Profile* profile,
      chrome::HostDesktopType host_desktop_type) {
    CreateParams params(TYPE_POPUP, profile, host_desktop_type);
    params.app_name = DevToolsWindow::kDevToolsApp;
    return params;
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  // Browser, InterstitialObserver:
  
  class Browser::InterstitialObserver : public content::WebContentsObserver {
   public:
    InterstitialObserver(Browser* browser, content::WebContents* web_contents)
        : WebContentsObserver(web_contents),
          browser_(browser) {
    }
  
    using content::WebContentsObserver::web_contents;
  
    virtual void DidAttachInterstitialPage() OVERRIDE {
      browser_->UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
    }
  
    virtual void DidDetachInterstitialPage() OVERRIDE {
      browser_->UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
    }
  
   private:
    Browser* browser_;
  
    DISALLOW_COPY_AND_ASSIGN(InterstitialObserver);
  };
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, Constructors, Creation, Showing:
  
  Browser::Browser(const CreateParams& params)
      : type_(params.type),
        profile_(params.profile),
        window_(NULL),
        tab_strip_model_delegate_(new chrome::BrowserTabStripModelDelegate(this)),
        tab_strip_model_(new TabStripModel(tab_strip_model_delegate_.get(),
                                           params.profile)),
        app_name_(params.app_name),
        app_type_(params.app_type),
        chrome_updater_factory_(this),
        cancel_download_confirmation_state_(NOT_PROMPTED),
        override_bounds_(params.initial_bounds),
        initial_show_state_(params.initial_show_state),
        is_session_restore_(params.is_session_restore),
        host_desktop_type_(params.host_desktop_type),
        unload_controller_(new chrome::UnloadController(this)),
        weak_factory_(this),
        content_setting_bubble_model_delegate_(
            new BrowserContentSettingBubbleModelDelegate(this)),
        toolbar_model_delegate_(new BrowserToolbarModelDelegate(this)),
        tab_restore_service_delegate_(new BrowserTabRestoreServiceDelegate(this)),
        synced_window_delegate_(new BrowserSyncedWindowDelegate(this)),
        bookmark_bar_state_(BookmarkBar::HIDDEN),
        command_controller_(new chrome::BrowserCommandController(
            this, g_browser_process->profile_manager())),
        window_has_shown_(false) {
    // If this causes a crash then a window is being opened using a profile type
    // that is disallowed by policy. The crash prevents the disabled window type
    // from opening at all, but the path that triggered it should be fixed.
    CHECK(IncognitoModePrefs::CanOpenBrowser(profile_));
  
    if (!app_name_.empty())
      chrome::RegisterAppPrefs(app_name_, profile_);
    tab_strip_model_->AddObserver(this);
  
    toolbar_model_.reset(new ToolbarModelImpl(toolbar_model_delegate_.get()));
    search_model_.reset(new SearchModel());
    search_delegate_.reset(
        new SearchDelegate(search_model_.get(), toolbar_model_.get()));
  
    registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
                   content::Source<Profile>(profile_->GetOriginalProfile()));
    registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
                   content::Source<Profile>(profile_->GetOriginalProfile()));
    registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNINSTALLED,
                   content::Source<Profile>(profile_->GetOriginalProfile()));
    registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_PROCESS_TERMINATED,
                   content::NotificationService::AllSources());
  #if defined(ENABLE_THEMES)
    registrar_.Add(
        this, chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
        content::Source<ThemeService>(
            ThemeServiceFactory::GetForProfile(profile_)));
  #endif
    registrar_.Add(this, chrome::NOTIFICATION_WEB_CONTENT_SETTINGS_CHANGED,
                   content::NotificationService::AllSources());
  
    profile_pref_registrar_.Init(profile_->GetPrefs());
    profile_pref_registrar_.Add(
        prefs::kDevToolsDisabled,
        base::Bind(&Browser::OnDevToolsDisabledChanged, base::Unretained(this)));
    profile_pref_registrar_.Add(
        prefs::kShowBookmarkBar,
        base::Bind(&Browser::UpdateBookmarkBarState, base::Unretained(this),
                   BOOKMARK_BAR_STATE_CHANGE_PREF_CHANGE));
  
    BrowserList::AddBrowser(this);
  
    // NOTE: These prefs all need to be explicitly destroyed in the destructor
    // or you'll get a nasty surprise when you run the incognito tests.
    encoding_auto_detect_.Init(prefs::kWebKitUsesUniversalDetector,
                               profile_->GetPrefs());
  
    if (is_type_tabbed())
      instant_controller_.reset(new BrowserInstantController(this));
  
    UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_INIT);
  
    ProfileMetrics::LogProfileLaunch(profile_);
  
    window_ = params.window ? params.window : CreateBrowserWindow(this);
  
    // TODO(beng): move to BrowserFrameWin.
  #if defined(OS_WIN)
    // Set the app user model id for this application to that of the application
    // name.  See http://crbug.com/7028.
    ui::win::SetAppIdForWindow(
        is_app() ?
        ShellIntegration::GetAppModelIdForProfile(UTF8ToWide(app_name_),
                                                  profile_->GetPath()) :
        ShellIntegration::GetChromiumModelIdForProfile(profile_->GetPath()),
        views::HWNDForNativeWindow(window()->GetNativeWindow()));
  #endif
  
    // Create the extension window controller before sending notifications.
    extension_window_controller_.reset(
        new BrowserExtensionWindowController(this));
  
    // TODO(beng): Move BrowserList::AddBrowser() to the end of this function and
    //             replace uses of this with BL's notifications.
    content::NotificationService::current()->Notify(
        chrome::NOTIFICATION_BROWSER_WINDOW_READY,
        content::Source<Browser>(this),
        content::NotificationService::NoDetails());
  
    // TODO(beng): move to ChromeBrowserMain:
    if (first_run::ShouldDoPersonalDataManagerFirstRun()) {
  #if defined(OS_WIN)
      // Notify PDM that this is a first run.
      ImportAutofillDataWin(
          autofill::PersonalDataManagerFactory::GetForProfile(profile_));
  #endif  // defined(OS_WIN)
    }
  
    fullscreen_controller_.reset(new FullscreenController(this));
    search_model_->AddObserver(this);
  }
  
  Browser::~Browser() {
    // The tab strip should not have any tabs at this point.
    if (!browser_shutdown::ShuttingDownWithoutClosingBrowsers())
      DCHECK(tab_strip_model_->empty());
  
    search_model_->RemoveObserver(this);
    tab_strip_model_->RemoveObserver(this);
  
    // Destroy the BrowserCommandController before removing the browser, so that
    // it doesn't act on any notifications that are sent as a result of removing
    // the browser.
    command_controller_.reset();
    BrowserList::RemoveBrowser(this);
  
    SessionService* session_service =
        SessionServiceFactory::GetForProfile(profile_);
    if (session_service)
      session_service->WindowClosed(session_id_);
  
    TabRestoreService* tab_restore_service =
        TabRestoreServiceFactory::GetForProfile(profile());
    if (tab_restore_service)
      tab_restore_service->BrowserClosed(tab_restore_service_delegate());
  
  #if !defined(OS_MACOSX)
    if (!chrome::GetTotalBrowserCountForProfile(profile_)) {
      // We're the last browser window with this profile. We need to nuke the
      // TabRestoreService, which will start the shutdown of the
      // NavigationControllers and allow for proper shutdown. If we don't do this
      // chrome won't shutdown cleanly, and may end up crashing when some
      // thread tries to use the IO thread (or another thread) that is no longer
      // valid.
      // This isn't a valid assumption for Mac OS, as it stays running after
      // the last browser has closed. The Mac equivalent is in its app
      // controller.
      TabRestoreServiceFactory::ResetForProfile(profile_);
    }
  #endif
  
    profile_pref_registrar_.RemoveAll();
  
    encoding_auto_detect_.Destroy();
  
    // Destroy BrowserExtensionWindowController before the incognito profile
    // is destroyed to make sure the chrome.windows.onRemoved event is sent.
    extension_window_controller_.reset();
  
    if (profile_->IsOffTheRecord() &&
        !BrowserList::IsOffTheRecordSessionActiveForProfile(profile_)) {
      // An incognito profile is no longer needed, this indirectly frees
      // its cache and cookies once it gets destroyed at the appropriate time.
      ProfileDestroyer::DestroyProfileWhenAppropriate(profile_);
    }
  
    // There may be pending file dialogs, we need to tell them that we've gone
    // away so they don't try and call back to us.
    if (select_file_dialog_.get())
      select_file_dialog_->ListenerDestroyed();
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Getters & Setters
  
  FindBarController* Browser::GetFindBarController() {
    if (!find_bar_controller_.get()) {
      FindBar* find_bar = window_->CreateFindBar();
      find_bar_controller_.reset(new FindBarController(find_bar));
      find_bar->SetFindBarController(find_bar_controller_.get());
      find_bar_controller_->ChangeWebContents(
          tab_strip_model_->GetActiveWebContents());
      find_bar_controller_->find_bar()->MoveWindowIfNecessary(gfx::Rect(), true);
    }
    return find_bar_controller_.get();
  }
  
  bool Browser::HasFindBarController() const {
    return find_bar_controller_.get() != NULL;
  }
  
  bool Browser::is_app() const {
    return !app_name_.empty();
  }
  
  bool Browser::is_devtools() const {
    return app_name_ == DevToolsWindow::kDevToolsApp;
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, State Storage and Retrieval for UI:
  
  gfx::Image Browser::GetCurrentPageIcon() const {
    WebContents* web_contents = tab_strip_model_->GetActiveWebContents();
    // |web_contents| can be NULL since GetCurrentPageIcon() is called by the
    // window during the window's creation (before tabs have been added).
    FaviconTabHelper* favicon_tab_helper =
        web_contents ? FaviconTabHelper::FromWebContents(web_contents) : NULL;
    return favicon_tab_helper ? favicon_tab_helper->GetFavicon() : gfx::Image();
  }
  
  string16 Browser::GetWindowTitleForCurrentTab() const {
    WebContents* contents = tab_strip_model_->GetActiveWebContents();
    string16 title;
  
    // |contents| can be NULL because GetWindowTitleForCurrentTab is called by the
    // window during the window's creation (before tabs have been added).
    if (contents) {
      title = contents->GetTitle();
      FormatTitleForDisplay(&title);
    }
    if (title.empty())
      title = CoreTabHelper::GetDefaultTitle();
  
  #if defined(OS_MACOSX)
    // On Mac, we don't want to suffix the page title with
    // the application name.
    return title;
  #elif defined(USE_ASH)
    // On Ash, we don't want to suffix the page title with the application name,
    // but on Windows, where USE_ASH can also be true, we still want the prefix
    // on desktop.
    if (host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH)
      return title;
  #endif
    // Don't append the app name to window titles on app frames and app popups
    return is_app() ?
        title :
        l10n_util::GetStringFUTF16(IDS_BROWSER_WINDOW_TITLE_FORMAT, title);
  }
  
  // static
  void Browser::FormatTitleForDisplay(string16* title) {
    size_t current_index = 0;
    size_t match_index;
    while ((match_index = title->find(L'\n', current_index)) != string16::npos) {
      title->replace(match_index, 1, string16());
      current_index = match_index;
    }
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, OnBeforeUnload handling:
  
  bool Browser::ShouldCloseWindow() {
    if (!CanCloseWithInProgressDownloads())
      return false;
  
    return unload_controller_->ShouldCloseWindow();
  }
  
  bool Browser::TabsNeedBeforeUnloadFired() {
    return unload_controller_->TabsNeedBeforeUnloadFired();
  }
  
  bool Browser::HasCompletedUnloadProcessing() const {
    return unload_controller_->HasCompletedUnloadProcessing();
  }
  
  bool Browser::IsAttemptingToCloseBrowser() const {
    return unload_controller_->is_attempting_to_close_browser();
  }
  
  void Browser::OnWindowClosing() {
    if (!ShouldCloseWindow())
      return;
  
    // Application should shutdown on last window close if the user is explicitly
    // trying to quit, or if there is nothing keeping the browser alive (such as
    // AppController on the Mac, or BackgroundContentsService for background
    // pages).
    bool should_quit_if_last_browser =
        browser_shutdown::IsTryingToQuit() || !chrome::WillKeepAlive();
  
    if (should_quit_if_last_browser &&
        BrowserList::GetInstance(host_desktop_type_)->size() == 1) {
      browser_shutdown::OnShutdownStarting(browser_shutdown::WINDOW_CLOSE);
    }
  
    // Don't use GetForProfileIfExisting here, we want to force creation of the
    // session service so that user can restore what was open.
    SessionService* session_service =
        SessionServiceFactory::GetForProfile(profile());
    if (session_service)
      session_service->WindowClosing(session_id());
  
    TabRestoreService* tab_restore_service =
        TabRestoreServiceFactory::GetForProfile(profile());
  
  #if defined(USE_AURA)
    if (tab_restore_service && is_app())
      tab_restore_service->BrowserClosing(tab_restore_service_delegate());
  #endif
  
    if (tab_restore_service && is_type_tabbed() && tab_strip_model_->count())
      tab_restore_service->BrowserClosing(tab_restore_service_delegate());
  
    // TODO(sky): convert session/tab restore to use notification.
    content::NotificationService::current()->Notify(
        chrome::NOTIFICATION_BROWSER_CLOSING,
        content::Source<Browser>(this),
        content::NotificationService::NoDetails());
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  // In-progress download termination handling:
  
  void Browser::InProgressDownloadResponse(bool cancel_downloads) {
    if (cancel_downloads) {
      cancel_download_confirmation_state_ = RESPONSE_RECEIVED;
      chrome::CloseWindow(this);
      return;
    }
  
    // Sets the confirmation state to NOT_PROMPTED so that if the user tries to
    // close again we'll show the warning again.
    cancel_download_confirmation_state_ = NOT_PROMPTED;
  
    // Show the download page so the user can figure-out what downloads are still
    // in-progress.
    chrome::ShowDownloads(this);
  }
  
  Browser::DownloadClosePreventionType Browser::OkToCloseWithInProgressDownloads(
      int* num_downloads_blocking) const {
    DCHECK(num_downloads_blocking);
    *num_downloads_blocking = 0;
  
    if (IsAttemptingToCloseBrowser())
      return DOWNLOAD_CLOSE_OK;
  
    // If we're not running a full browser process with a profile manager
    // (testing), it's ok to close the browser.
    if (!g_browser_process->profile_manager())
      return DOWNLOAD_CLOSE_OK;
  
    int total_download_count = DownloadService::DownloadCountAllProfiles();
    if (total_download_count == 0)
      return DOWNLOAD_CLOSE_OK;   // No downloads; can definitely close.
  
    // Figure out how many windows are open total, and associated with this
    // profile, that are relevant for the ok-to-close decision.
    int profile_window_count = 0;
    int total_window_count = 0;
    for (chrome::BrowserIterator it; !it.done(); it.Next()) {
      // Don't count this browser window or any other in the process of closing.
      Browser* const browser = *it;
      // Window closing may be delayed, and windows that are in the process of
      // closing don't count against our totals.
      if (browser == this || browser->IsAttemptingToCloseBrowser())
        continue;
  
      if (it->profile() == profile())
        profile_window_count++;
      total_window_count++;
    }
  
    // If there aren't any other windows, we're at browser shutdown,
    // which would cancel all current downloads.
    if (total_window_count == 0) {
      *num_downloads_blocking = total_download_count;
      return DOWNLOAD_CLOSE_BROWSER_SHUTDOWN;
    }
  
    // If there aren't any other windows on our profile, and we're an incognito
    // profile, and there are downloads associated with that profile,
    // those downloads would be cancelled by our window (-> profile) close.
    DownloadService* download_service =
        DownloadServiceFactory::GetForProfile(profile());
    if (profile_window_count == 0 && download_service->DownloadCount() > 0 &&
        profile()->IsOffTheRecord()) {
      *num_downloads_blocking = download_service->DownloadCount();
      return DOWNLOAD_CLOSE_LAST_WINDOW_IN_INCOGNITO_PROFILE;
    }
  
    // Those are the only conditions under which we will block shutdown.
    return DOWNLOAD_CLOSE_OK;
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  // Browser, Tab adding/showing functions:
  
  void Browser::WindowFullscreenStateChanged() {
    fullscreen_controller_->WindowFullscreenStateChanged();
    command_controller_->FullscreenStateChanged();
    UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TOGGLE_FULLSCREEN);
  }
  
  void Browser::VisibleSSLStateChanged(content::WebContents* web_contents) {
    // When the current tab's SSL state changes, we need to update the URL
    // bar to reflect the new state.
    DCHECK(web_contents);
    if (tab_strip_model_->GetActiveWebContents() == web_contents)
      UpdateToolbar(false);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, Assorted browser commands:
  
  void Browser::ToggleFullscreenModeWithExtension(const GURL& extension_url) {
    fullscreen_controller_->ToggleFullscreenModeWithExtension(extension_url);
  }
  
  bool Browser::SupportsWindowFeature(WindowFeature feature) const {
    return SupportsWindowFeatureImpl(feature, true);
  }
  
  bool Browser::CanSupportWindowFeature(WindowFeature feature) const {
    return SupportsWindowFeatureImpl(feature, false);
  }
  
  void Browser::ToggleEncodingAutoDetect() {
    content::RecordAction(UserMetricsAction("AutoDetectChange"));
    encoding_auto_detect_.SetValue(!encoding_auto_detect_.GetValue());
    // If "auto detect" is turned on, then any current override encoding
    // is cleared. This also implicitly performs a reload.
    // OTOH, if "auto detect" is turned off, we don't change the currently
    // active encoding.
    if (encoding_auto_detect_.GetValue()) {
      WebContents* contents = tab_strip_model_->GetActiveWebContents();
      if (contents)
        contents->ResetOverrideEncoding();
    }
  }
  
  void Browser::OverrideEncoding(int encoding_id) {
    content::RecordAction(UserMetricsAction("OverrideEncoding"));
    const std::string selected_encoding =
        CharacterEncoding::GetCanonicalEncodingNameByCommandId(encoding_id);
    WebContents* contents = tab_strip_model_->GetActiveWebContents();
    if (!selected_encoding.empty() && contents)
       contents->SetOverrideEncoding(selected_encoding);
    // Update the list of recently selected encodings.
    std::string new_selected_encoding_list;
    if (CharacterEncoding::UpdateRecentlySelectedEncoding(
          profile_->GetPrefs()->GetString(prefs::kRecentlySelectedEncoding),
          encoding_id,
          &new_selected_encoding_list)) {
      profile_->GetPrefs()->SetString(prefs::kRecentlySelectedEncoding,
                                      new_selected_encoding_list);
    }
  }
  
  void Browser::OpenFile() {
    content::RecordAction(UserMetricsAction("OpenFile"));
    select_file_dialog_ = ui::SelectFileDialog::Create(
        this, new ChromeSelectFilePolicy(
            tab_strip_model_->GetActiveWebContents()));
  
    const base::FilePath directory = profile_->last_selected_directory();
  
    // TODO(beng): figure out how to juggle this.
    gfx::NativeWindow parent_window = window_->GetNativeWindow();
    ui::SelectFileDialog::FileTypeInfo file_types;
    file_types.support_drive = true;
    select_file_dialog_->SelectFile(ui::SelectFileDialog::SELECT_OPEN_FILE,
                                    string16(),
                                    directory,
                                    &file_types,
                                    0,
                                    base::FilePath::StringType(),
                                    parent_window,
                                    NULL);
  }
  
  void Browser::UpdateDownloadShelfVisibility(bool visible) {
    if (GetStatusBubble())
      GetStatusBubble()->UpdateDownloadShelfVisibility(visible);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  
  // static
  bool Browser::RunUnloadEventsHelper(WebContents* contents) {
    // If the WebContents is not connected yet, then there's no unload
    // handler we can fire even if the WebContents has an unload listener.
    // One case where we hit this is in a tab that has an infinite loop
    // before load.
    if (contents->NeedToFireBeforeUnload()) {
      // If the page has unload listeners, then we tell the renderer to fire
      // them. Once they have fired, we'll get a message back saying whether
      // to proceed closing the page or not, which sends us back to this method
      // with the NeedToFireBeforeUnload bit cleared.
      contents->GetRenderViewHost()->FirePageBeforeUnload(false);
      return true;
    }
    return false;
  }
  
  // static
  void Browser::JSOutOfMemoryHelper(WebContents* web_contents) {
    InfoBarService* infobar_service =
        InfoBarService::FromWebContents(web_contents);
    if (!infobar_service)
      return;
  
    SimpleAlertInfoBarDelegate::Create(
        infobar_service, InfoBarDelegate::kNoIconID,
        l10n_util::GetStringUTF16(IDS_JS_OUT_OF_MEMORY_PROMPT), true);
  }
  
  // static
  void Browser::RegisterProtocolHandlerHelper(WebContents* web_contents,
                                              const std::string& protocol,
                                              const GURL& url,
                                              const string16& title,
                                              bool user_gesture,
                                              BrowserWindow* window) {
    Profile* profile =
        Profile::FromBrowserContext(web_contents->GetBrowserContext());
    if (profile->IsOffTheRecord())
      return;
  
    ProtocolHandler handler =
        ProtocolHandler::CreateProtocolHandler(protocol, url, title);
  
    ProtocolHandlerRegistry* registry =
        ProtocolHandlerRegistryFactory::GetForProfile(profile);
    if (registry->SilentlyHandleRegisterHandlerRequest(handler))
      return;
  
    TabSpecificContentSettings* tab_content_settings =
        TabSpecificContentSettings::FromWebContents(web_contents);
    if (!user_gesture && window) {
      tab_content_settings->set_pending_protocol_handler(handler);
      tab_content_settings->set_previous_protocol_handler(
          registry->GetHandlerFor(handler.protocol()));
      window->GetLocationBar()->UpdateContentSettingsIcons();
      return;
    }
  
    // Make sure content-setting icon is turned off in case the page does
    // ungestured and gestured RPH calls.
    if (window) {
      tab_content_settings->ClearPendingProtocolHandler();
      window->GetLocationBar()->UpdateContentSettingsIcons();
    }
  
    RegisterProtocolHandlerInfoBarDelegate::Create(
        InfoBarService::FromWebContents(web_contents), registry, handler);
  }
  
  // static
  void Browser::FindReplyHelper(WebContents* web_contents,
                                int request_id,
                                int number_of_matches,
                                const gfx::Rect& selection_rect,
                                int active_match_ordinal,
                                bool final_update) {
    FindTabHelper* find_tab_helper = FindTabHelper::FromWebContents(web_contents);
    if (!find_tab_helper)
      return;
  
    find_tab_helper->HandleFindReply(request_id,
                                     number_of_matches,
                                     selection_rect,
                                     active_match_ordinal,
                                     final_update);
  }
  
  void Browser::UpdateUIForNavigationInTab(WebContents* contents,
                                           content::PageTransition transition,
                                           bool user_initiated) {
    tab_strip_model_->TabNavigating(contents, transition);
  
    bool contents_is_selected =
        contents == tab_strip_model_->GetActiveWebContents();
    if (user_initiated && contents_is_selected && window()->GetLocationBar()) {
      // Forcibly reset the location bar if the url is going to change in the
      // current tab, since otherwise it won't discard any ongoing user edits,
      // since it doesn't realize this is a user-initiated action.
      window()->GetLocationBar()->Revert();
    }
  
    if (GetStatusBubble())
      GetStatusBubble()->Hide();
  
    // Update the location bar. This is synchronous. We specifically don't
    // update the load state since the load hasn't started yet and updating it
    // will put it out of sync with the actual state like whether we're
    // displaying a favicon, which controls the throbber. If we updated it here,
    // the throbber will show the default favicon for a split second when
    // navigating away from the new tab page.
    ScheduleUIUpdate(contents, content::INVALIDATE_TYPE_URL);
  
    if (contents_is_selected)
      contents->GetView()->SetInitialFocus();
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, PageNavigator implementation:
  
  WebContents* Browser::OpenURL(const OpenURLParams& params) {
    return OpenURLFromTab(NULL, params);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, TabStripModelObserver implementation:
  
  void Browser::TabInsertedAt(WebContents* contents,
                              int index,
                              bool foreground) {
    SetAsDelegate(contents, this);
    SessionTabHelper* session_tab_helper =
        SessionTabHelper::FromWebContents(contents);
    session_tab_helper->SetWindowID(session_id());
  
    content::NotificationService::current()->Notify(
        chrome::NOTIFICATION_TAB_PARENTED,
        content::Source<content::WebContents>(contents),
        content::NotificationService::NoDetails());
  
    SyncHistoryWithTabs(index);
  
    // Make sure the loading state is updated correctly, otherwise the throbber
    // won't start if the page is loading.
    LoadingStateChanged(contents);
  
    interstitial_observers_.push_back(new InterstitialObserver(this, contents));
  
    SessionService* session_service =
        SessionServiceFactory::GetForProfile(profile_);
    if (session_service) {
      session_service->TabInserted(contents);
      int new_active_index = tab_strip_model_->active_index();
      if (index < new_active_index)
        session_service->SetSelectedTabInWindow(session_id(),
                                                new_active_index);
    }
  }
  
  void Browser::TabClosingAt(TabStripModel* tab_strip_model,
                             WebContents* contents,
                             int index) {
    fullscreen_controller_->OnTabClosing(contents);
    SessionService* session_service =
        SessionServiceFactory::GetForProfile(profile_);
    if (session_service)
      session_service->TabClosing(contents);
    content::NotificationService::current()->Notify(
        chrome::NOTIFICATION_TAB_CLOSING,
        content::Source<NavigationController>(&contents->GetController()),
        content::NotificationService::NoDetails());
  
    // Sever the WebContents' connection back to us.
    SetAsDelegate(contents, NULL);
  }
  
  void Browser::TabDetachedAt(WebContents* contents, int index) {
    // TabDetachedAt is called before TabStripModel has updated the
    // active index.
    int old_active_index = tab_strip_model_->active_index();
    if (index < old_active_index && !tab_strip_model_->closing_all()) {
      SessionService* session_service =
          SessionServiceFactory::GetForProfileIfExisting(profile_);
      if (session_service)
        session_service->SetSelectedTabInWindow(session_id(),
                                                old_active_index - 1);
    }
    TabDetachedAtImpl(contents, index, DETACH_TYPE_DETACH);
  }
  
  void Browser::TabDeactivated(WebContents* contents) {
    fullscreen_controller_->OnTabDeactivated(contents);
    search_delegate_->OnTabDeactivated(contents);
  
    // Save what the user's currently typing, so it can be restored when we
    // switch back to this tab.
    window_->GetLocationBar()->SaveStateToContents(contents);
  
    if (instant_controller_)
      instant_controller_->TabDeactivated(contents);
  }
  
  void Browser::ActiveTabChanged(WebContents* old_contents,
                                 WebContents* new_contents,
                                 int index,
                                 int reason) {
    content::RecordAction(UserMetricsAction("ActiveTabChanged"));
  
    // Discarded tabs always get reloaded.
    if (tab_strip_model_->IsTabDiscarded(index)) {
      LOG(WARNING) << "Reloading discarded tab at " << index;
      static int reload_count = 0;
      UMA_HISTOGRAM_CUSTOM_COUNTS(
          "Tabs.Discard.ReloadCount", ++reload_count, 1, 1000, 50);
      chrome::Reload(this, CURRENT_TAB);
    }
  
    // If we have any update pending, do it now.
    if (chrome_updater_factory_.HasWeakPtrs() && old_contents)
      ProcessPendingUIUpdates();
  
    // Propagate the profile to the location bar.
    UpdateToolbar((reason & CHANGE_REASON_REPLACED) == 0);
  
    // Propagate tab state to toolbar, tab-strip, etc.
    UpdateSearchState(new_contents);
  
    // Update reload/stop state.
    command_controller_->LoadingStateChanged(new_contents->IsLoading(), true);
  
    // Update commands to reflect current state.
    command_controller_->TabStateChanged();
  
    // Reset the status bubble.
    StatusBubble* status_bubble = GetStatusBubble();
    if (status_bubble) {
      status_bubble->Hide();
  
      // Show the loading state (if any).
      status_bubble->SetStatus(CoreTabHelper::FromWebContents(
          tab_strip_model_->GetActiveWebContents())->GetStatusText());
    }
  
    if (HasFindBarController()) {
      find_bar_controller_->ChangeWebContents(new_contents);
      find_bar_controller_->find_bar()->MoveWindowIfNecessary(gfx::Rect(), true);
    }
  
    // Update sessions. Don't force creation of sessions. If sessions doesn't
    // exist, the change will be picked up by sessions when created.
    SessionService* session_service =
        SessionServiceFactory::GetForProfileIfExisting(profile_);
    if (session_service && !tab_strip_model_->closing_all()) {
      session_service->SetSelectedTabInWindow(session_id(),
                                              tab_strip_model_->active_index());
    }
  
    UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_SWITCH);
  
    // This needs to be called after UpdateSearchState().
    if (instant_controller_)
      instant_controller_->ActiveTabChanged();
  }
  
  void Browser::TabMoved(WebContents* contents,
                         int from_index,
                         int to_index) {
    DCHECK(from_index >= 0 && to_index >= 0);
    // Notify the history service.
    SyncHistoryWithTabs(std::min(from_index, to_index));
  }
  
  void Browser::TabReplacedAt(TabStripModel* tab_strip_model,
                              WebContents* old_contents,
                              WebContents* new_contents,
                              int index) {
    TabDetachedAtImpl(old_contents, index, DETACH_TYPE_REPLACE);
    SessionService* session_service =
        SessionServiceFactory::GetForProfile(profile_);
    if (session_service)
      session_service->TabClosing(old_contents);
    TabInsertedAt(new_contents,
                  index,
                  (index == tab_strip_model_->active_index()));
  
    int entry_count = new_contents->GetController().GetEntryCount();
    if (entry_count > 0) {
      // Send out notification so that observers are updated appropriately.
      new_contents->GetController().NotifyEntryChanged(
          new_contents->GetController().GetEntryAtIndex(entry_count - 1),
          entry_count - 1);
    }
  
    if (session_service) {
      // The new_contents may end up with a different navigation stack. Force
      // the session service to update itself.
      session_service->TabRestored(new_contents,
                                   tab_strip_model_->IsTabPinned(index));
    }
  }
  
  void Browser::TabPinnedStateChanged(WebContents* contents, int index) {
    SessionService* session_service =
        SessionServiceFactory::GetForProfileIfExisting(profile());
    if (session_service) {
      SessionTabHelper* session_tab_helper =
          SessionTabHelper::FromWebContents(contents);
      session_service->SetPinnedState(session_id(),
                                      session_tab_helper->session_id(),
                                      tab_strip_model_->IsTabPinned(index));
    }
  }
  
  void Browser::TabStripEmpty() {
    // Close the frame after we return to the message loop (not immediately,
    // otherwise it will destroy this object before the stack has a chance to
    // cleanly unwind.)
    // Note: This will be called several times if TabStripEmpty is called several
    //       times. This is because it does not close the window if tabs are
    //       still present.
    base::MessageLoop::current()->PostTask(
        FROM_HERE, base::Bind(&Browser::CloseFrame, weak_factory_.GetWeakPtr()));
  
    // Instant may have visible WebContents that need to be detached before the
    // window system closes.
    instant_controller_.reset();
  }
  
  bool Browser::CanOverscrollContent() const {
  #if defined(USE_AURA)
    bool overscroll_enabled = CommandLine::ForCurrentProcess()->
        GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
    if (!overscroll_enabled)
      return false;
    if (is_app() || is_devtools() || !is_type_tabbed())
      return false;
  
    // The detached bookmark bar has appearance of floating above the
    // web-contents. This does not play nicely with overscroll navigation
    // gestures. So disable overscroll navigation when the bookmark bar is in the
    // detached state.
    if (bookmark_bar_state_ == BookmarkBar::DETACHED)
      return false;
    return true;
  #else
    return false;
  #endif
  }
  
  bool Browser::PreHandleKeyboardEvent(content::WebContents* source,
                                       const NativeWebKeyboardEvent& event,
                                       bool* is_keyboard_shortcut) {
    // Escape exits tabbed fullscreen mode.
    // TODO(koz): Write a test for this http://crbug.com/100441.
    if (event.windowsKeyCode == 27 &&
        fullscreen_controller_->HandleUserPressedEscape()) {
      return true;
    }
    return window()->PreHandleKeyboardEvent(event, is_keyboard_shortcut);
  }
  
  void Browser::HandleKeyboardEvent(content::WebContents* source,
                                    const NativeWebKeyboardEvent& event) {
    window()->HandleKeyboardEvent(event);
  }
  
  bool Browser::IsMouseLocked() const {
    return fullscreen_controller_->IsMouseLocked();
  }
  
  void Browser::OnWindowDidShow() {
    if (window_has_shown_)
      return;
    window_has_shown_ = true;
  
  // CurrentProcessInfo::CreationTime() is currently only implemented on Mac and
  // Windows.
  #if defined(OS_MACOSX) || defined(OS_WIN)
    // Measure the latency from startup till the first browser window becomes
    // visible.
    static bool is_first_browser_window = true;
    if (is_first_browser_window &&
        !startup_metric_utils::WasNonBrowserUIDisplayed()) {
      is_first_browser_window = false;
      const base::Time* process_creation_time =
          base::CurrentProcessInfo::CreationTime();
  
      if (process_creation_time) {
        UMA_HISTOGRAM_LONG_TIMES(
            "Startup.BrowserWindowDisplay",
            base::Time::Now() - *process_creation_time);
      }
    }
  #endif  // defined(OS_MACOSX) || defined(OS_WIN)
  
    // Nothing to do for non-tabbed windows.
    if (!is_type_tabbed())
      return;
  
    // Show any pending global error bubble.
    GlobalErrorService* service =
        GlobalErrorServiceFactory::GetForProfile(profile());
    GlobalError* error = service->GetFirstGlobalErrorWithBubbleView();
    if (error)
      error->ShowBubbleView(this);
  }
  
  void Browser::ShowFirstRunBubble() {
    window()->GetLocationBar()->ShowFirstRunBubble();
  }
  
  void Browser::ShowDownload(content::DownloadItem* download) {
    if (!window())
      return;
  
    // If the download occurs in a new tab, and it's not a save page
    // download (started before initial navigation completed) close it.
    WebContents* source = download->GetWebContents();
    if (source && source->GetController().IsInitialNavigation() &&
        tab_strip_model_->count() > 1 && !download->IsSavePackageDownload()) {
      CloseContents(source);
    }
  
    // Some (app downloads) are not supposed to appear on the shelf.
    if (!DownloadItemModel(download).ShouldShowInShelf())
      return;
  
    // GetDownloadShelf creates the download shelf if it was not yet created.
    DownloadShelf* shelf = window()->GetDownloadShelf();
    shelf->AddDownload(download);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, content::WebContentsDelegate implementation:
  
  WebContents* Browser::OpenURLFromTab(WebContents* source,
                                       const OpenURLParams& params) {
    chrome::NavigateParams nav_params(this, params.url, params.transition);
    FillNavigateParamsFromOpenURLParams(&nav_params, params);
    nav_params.source_contents = source;
    nav_params.tabstrip_add_types = TabStripModel::ADD_NONE;
    nav_params.window_action = chrome::NavigateParams::SHOW_WINDOW;
    nav_params.user_gesture = true;
    chrome::Navigate(&nav_params);
  
    return nav_params.target_contents;
  }
  
  void Browser::NavigationStateChanged(const WebContents* source,
                                       unsigned changed_flags) {
    // Only update the UI when something visible has changed.
    if (changed_flags)
      ScheduleUIUpdate(source, changed_flags);
  
    // We can synchronously update commands since they will only change once per
    // navigation, so we don't have to worry about flickering. We do, however,
    // need to update the command state early on load to always present usable
    // actions in the face of slow-to-commit pages.
    if (changed_flags & (content::INVALIDATE_TYPE_URL |
                         content::INVALIDATE_TYPE_LOAD))
      command_controller_->TabStateChanged();
  }
  
  void Browser::AddNewContents(WebContents* source,
                               WebContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture,
                               bool* was_blocked) {
    chrome::AddWebContents(this, source, new_contents, disposition, initial_pos,
                           user_gesture, was_blocked);
  }
  
  void Browser::ActivateContents(WebContents* contents) {
    tab_strip_model_->ActivateTabAt(
        tab_strip_model_->GetIndexOfWebContents(contents), false);
    window_->Activate();
  }
  
  void Browser::DeactivateContents(WebContents* contents) {
    window_->Deactivate();
  }
  
  void Browser::LoadingStateChanged(WebContents* source) {
    window_->UpdateLoadingAnimations(tab_strip_model_->TabsAreLoading());
    window_->UpdateTitleBar();
  
    WebContents* selected_contents = tab_strip_model_->GetActiveWebContents();
    if (source == selected_contents) {
      bool is_loading = source->IsLoading();
      command_controller_->LoadingStateChanged(is_loading, false);
      if (GetStatusBubble()) {
        GetStatusBubble()->SetStatus(CoreTabHelper::FromWebContents(
            tab_strip_model_->GetActiveWebContents())->GetStatusText());
      }
    }
  }
  
  void Browser::CloseContents(WebContents* source) {
    if (unload_controller_->CanCloseContents(source))
      chrome::CloseWebContents(this, source, true);
  }
  
  void Browser::MoveContents(WebContents* source, const gfx::Rect& pos) {
    if (!IsPopupOrPanel(source)) {
      NOTREACHED() << "moving invalid browser type";
      return;
    }
    window_->SetBounds(pos);
  }
  
  bool Browser::IsPopupOrPanel(const WebContents* source) const {
    return is_type_popup();
  }
  
  void Browser::UpdateTargetURL(WebContents* source, int32 page_id,
                                const GURL& url) {
    if (!GetStatusBubble())
      return;
  
    if (source == tab_strip_model_->GetActiveWebContents()) {
      PrefService* prefs = profile_->GetPrefs();
      GetStatusBubble()->SetURL(url, prefs->GetString(prefs::kAcceptLanguages));
    }
  }
  
  void Browser::ContentsMouseEvent(
      WebContents* source, const gfx::Point& location, bool motion) {
    if (!GetStatusBubble())
      return;
  
    if (source == tab_strip_model_->GetActiveWebContents()) {
      GetStatusBubble()->MouseMoved(location, !motion);
      if (!motion)
        GetStatusBubble()->SetURL(GURL(), std::string());
    }
  }
  
  void Browser::ContentsZoomChange(bool zoom_in) {
    chrome::ExecuteCommand(this, zoom_in ? IDC_ZOOM_PLUS : IDC_ZOOM_MINUS);
  }
  
  void Browser::WebContentsFocused(WebContents* contents) {
    window_->WebContentsFocused(contents);
  }
  
  bool Browser::TakeFocus(content::WebContents* source,
                          bool reverse) {
    content::NotificationService::current()->Notify(
        chrome::NOTIFICATION_FOCUS_RETURNED_TO_BROWSER,
        content::Source<Browser>(this),
        content::NotificationService::NoDetails());
    return false;
  }
  
  gfx::Rect Browser::GetRootWindowResizerRect() const {
    return window_->GetRootWindowResizerRect();
  }
  
  void Browser::BeforeUnloadFired(WebContents* web_contents,
                                  bool proceed,
                                  bool* proceed_to_fire_unload) {
    *proceed_to_fire_unload =
        unload_controller_->BeforeUnloadFired(web_contents, proceed);
  }
  
  bool Browser::ShouldFocusLocationBarByDefault(WebContents* source) {
    const content::NavigationEntry* entry =
        source->GetController().GetActiveEntry();
    if (entry) {
      GURL url = entry->GetURL();
      GURL virtual_url = entry->GetVirtualURL();
      if ((url.SchemeIs(chrome::kChromeUIScheme) &&
          url.host() == chrome::kChromeUINewTabHost) ||
          (virtual_url.SchemeIs(chrome::kChromeUIScheme) &&
          virtual_url.host() == chrome::kChromeUINewTabHost)) {
        return true;
      }
    }
  
    return chrome::NavEntryIsInstantNTP(source, entry);
  }
  
  void Browser::SetFocusToLocationBar(bool select_all) {
    // Two differences between this and FocusLocationBar():
    // (1) This doesn't get recorded in user metrics, since it's called
    //     internally.
    // (2) This checks whether the location bar can be focused, and if not, clears
    //     the focus.  FocusLocationBar() is only reached when the location bar is
    //     focusable, but this may be reached at other times, e.g. while in
    //     fullscreen mode, where we need to leave focus in a consistent state.
    window_->SetFocusToLocationBar(select_all);
  }
  
  void Browser::RenderWidgetShowing() {
    window_->DisableInactiveFrame();
  }
  
  int Browser::GetExtraRenderViewHeight() const {
    return window_->GetExtraRenderViewHeight();
  }
  
  void Browser::ViewSourceForTab(WebContents* source, const GURL& page_url) {
    DCHECK(source);
    chrome::ViewSource(this, source);
  }
  
  void Browser::ViewSourceForFrame(WebContents* source,
                                   const GURL& frame_url,
                                   const content::PageState& frame_page_state) {
    DCHECK(source);
    chrome::ViewSource(this, source, frame_url, frame_page_state);
  }
  
  void Browser::ShowRepostFormWarningDialog(WebContents* source) {
    TabModalConfirmDialog::Create(new RepostFormWarningController(source),
                                  source);
  }
  
  bool Browser::ShouldCreateWebContents(
      WebContents* web_contents,
      int route_id,
      WindowContainerType window_container_type,
      const string16& frame_name,
      const GURL& target_url) {
    if (window_container_type == WINDOW_CONTAINER_TYPE_BACKGROUND) {
      // If a BackgroundContents is created, suppress the normal WebContents.
      return !MaybeCreateBackgroundContents(
          route_id, web_contents, frame_name, target_url);
    }
  
    return true;
  }
  
  void Browser::WebContentsCreated(WebContents* source_contents,
                                   int64 source_frame_id,
                                   const string16& frame_name,
                                   const GURL& target_url,
                                   WebContents* new_contents) {
    // Adopt the WebContents now, so all observers are in place, as the network
    // requests for its initial navigation will start immediately. The WebContents
    // will later be inserted into this browser using Browser::Navigate via
    // AddNewContents.
    BrowserTabContents::AttachTabHelpers(new_contents);
  
    // Notify.
    RetargetingDetails details;
    details.source_web_contents = source_contents;
    details.source_frame_id = source_frame_id;
    details.target_url = target_url;
    details.target_web_contents = new_contents;
    details.not_yet_in_tabstrip = true;
    content::NotificationService::current()->Notify(
        chrome::NOTIFICATION_RETARGETING,
        content::Source<Profile>(profile_),
        content::Details<RetargetingDetails>(&details));
  }
  
  void Browser::ContentRestrictionsChanged(WebContents* source) {
    command_controller_->ContentRestrictionsChanged();
  }
  
  void Browser::RendererUnresponsive(WebContents* source) {
    // Ignore hangs if a tab is blocked.
    int index = tab_strip_model_->GetIndexOfWebContents(source);
    DCHECK_NE(TabStripModel::kNoTab, index);
    if (tab_strip_model_->IsTabBlocked(index))
      return;
  
    chrome::ShowHungRendererDialog(source);
  }
  
  void Browser::RendererResponsive(WebContents* source) {
    chrome::HideHungRendererDialog(source);
  }
  
  void Browser::WorkerCrashed(WebContents* source) {
    SimpleAlertInfoBarDelegate::Create(
        InfoBarService::FromWebContents(source), InfoBarDelegate::kNoIconID,
        l10n_util::GetStringUTF16(IDS_WEBWORKER_CRASHED_PROMPT), true);
  }
  
  void Browser::DidNavigateMainFramePostCommit(WebContents* web_contents) {
    if (web_contents == tab_strip_model_->GetActiveWebContents())
      UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
  }
  
  void Browser::DidNavigateToPendingEntry(WebContents* web_contents) {
    if (web_contents == tab_strip_model_->GetActiveWebContents())
      UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
  }
  
  content::JavaScriptDialogManager* Browser::GetJavaScriptDialogManager() {
    return GetJavaScriptDialogManagerInstance();
  }
  
  content::ColorChooser* Browser::OpenColorChooser(WebContents* web_contents,
                                                   SkColor initial_color) {
    return chrome::ShowColorChooser(web_contents, initial_color);
  }
  
  void Browser::RunFileChooser(WebContents* web_contents,
                               const content::FileChooserParams& params) {
    FileSelectHelper::RunFileChooser(web_contents, params);
  }
  
  void Browser::EnumerateDirectory(WebContents* web_contents,
                                   int request_id,
                                   const base::FilePath& path) {
    FileSelectHelper::EnumerateDirectory(web_contents, request_id, path);
  }
  
  void Browser::ToggleFullscreenModeForTab(WebContents* web_contents,
                                           bool enter_fullscreen) {
    fullscreen_controller_->ToggleFullscreenModeForTab(web_contents,
                                                       enter_fullscreen);
  }
  
  bool Browser::IsFullscreenForTabOrPending(
      const WebContents* web_contents) const {
    return fullscreen_controller_->IsFullscreenForTabOrPending(web_contents);
  }
  
  void Browser::JSOutOfMemory(WebContents* web_contents) {
    JSOutOfMemoryHelper(web_contents);
  }
  
  void Browser::RegisterProtocolHandler(WebContents* web_contents,
                                        const std::string& protocol,
                                        const GURL& url,
                                        const string16& title,
                                        bool user_gesture) {
    RegisterProtocolHandlerHelper(
        web_contents, protocol, url, title, user_gesture, window());
  }
  
  void Browser::UpdatePreferredSize(WebContents* source,
                                    const gfx::Size& pref_size) {
    window_->UpdatePreferredSize(source, pref_size);
  }
  
  void Browser::ResizeDueToAutoResize(WebContents* source,
                                      const gfx::Size& new_size) {
    window_->ResizeDueToAutoResize(source, new_size);
  }
  
  void Browser::FindReply(WebContents* web_contents,
                          int request_id,
                          int number_of_matches,
                          const gfx::Rect& selection_rect,
                          int active_match_ordinal,
                          bool final_update) {
    FindReplyHelper(web_contents, request_id, number_of_matches, selection_rect,
                    active_match_ordinal, final_update);
  }
  
  void Browser::RequestToLockMouse(WebContents* web_contents,
                                   bool user_gesture,
                                   bool last_unlocked_by_target) {
    fullscreen_controller_->RequestToLockMouse(web_contents,
                                               user_gesture,
                                               last_unlocked_by_target);
  }
  
  void Browser::LostMouseLock() {
    fullscreen_controller_->LostMouseLock();
  }
  
  void Browser::RequestMediaAccessPermission(
      content::WebContents* web_contents,
      const content::MediaStreamRequest& request,
      const content::MediaResponseCallback& callback) {
    const extensions::Extension* extension = NULL;
    GURL origin(request.security_origin);
    if (origin.SchemeIs(extensions::kExtensionScheme)) {
      ExtensionService* extensions_service =
          extensions::ExtensionSystem::Get(profile_)->extension_service();
      extension = extensions_service->extensions()->GetByID(origin.host());
      DCHECK(extension);
    }
  
    MediaCaptureDevicesDispatcher::GetInstance()->ProcessMediaAccessRequest(
        web_contents, request, callback, extension);
  }
  
  bool Browser::RequestPpapiBrokerPermission(
      WebContents* web_contents,
      const GURL& url,
      const base::FilePath& plugin_path,
      const base::Callback<void(bool)>& callback) {
    PepperBrokerInfoBarDelegate::Create(web_contents, url, plugin_path, callback);
    return true;
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, CoreTabHelperDelegate implementation:
  
  void Browser::SwapTabContents(content::WebContents* old_contents,
                                content::WebContents* new_contents) {
    int index = tab_strip_model_->GetIndexOfWebContents(old_contents);
    DCHECK_NE(TabStripModel::kNoTab, index);
    tab_strip_model_->ReplaceWebContentsAt(index, new_contents);
  }
  
  bool Browser::CanReloadContents(content::WebContents* web_contents) const {
    return chrome::CanReload(this);
  }
  
  bool Browser::CanSaveContents(content::WebContents* web_contents) const {
    return chrome::CanSavePage(this);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, SearchEngineTabHelperDelegate implementation:
  
  void Browser::ConfirmAddSearchProvider(TemplateURL* template_url,
                                         Profile* profile) {
    window()->ConfirmAddSearchProvider(template_url, profile);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, web_modal::WebContentsModalDialogManagerDelegate implementation:
  
  void Browser::SetWebContentsBlocked(content::WebContents* web_contents,
                                      bool blocked) {
    int index = tab_strip_model_->GetIndexOfWebContents(web_contents);
    if (index == TabStripModel::kNoTab) {
      NOTREACHED();
      return;
    }
    tab_strip_model_->SetTabBlocked(index, blocked);
    if (!blocked && tab_strip_model_->GetActiveWebContents() == web_contents)
      web_contents->GetView()->Focus();
  }
  
  web_modal::WebContentsModalDialogHost*
  Browser::GetWebContentsModalDialogHost() {
    return window_->GetWebContentsModalDialogHost();
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, BlockedContentTabHelperDelegate implementation:
  
  content::WebContents* Browser::GetConstrainingWebContents(
      content::WebContents* source) {
    return source;
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, BookmarkTabHelperDelegate implementation:
  
  void Browser::URLStarredChanged(content::WebContents* web_contents,
                                  bool starred) {
    if (web_contents == tab_strip_model_->GetActiveWebContents())
      window_->SetStarredState(starred);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, ZoomObserver implementation:
  
  void Browser::OnZoomChanged(content::WebContents* source,
                              bool can_show_bubble) {
    if (source == tab_strip_model_->GetActiveWebContents()) {
      // Only show the zoom bubble for zoom changes in the active window.
      window_->ZoomChangedForActiveTab(can_show_bubble && window_->IsActive());
    }
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, ui::SelectFileDialog::Listener implementation:
  
  void Browser::FileSelected(const base::FilePath& path, int index,
                             void* params) {
    FileSelectedWithExtraInfo(ui::SelectedFileInfo(path, path), index, params);
  }
  
  void Browser::FileSelectedWithExtraInfo(const ui::SelectedFileInfo& file_info,
                                          int index,
                                          void* params) {
    profile_->set_last_selected_directory(file_info.file_path.DirName());
  
    GURL url = net::FilePathToFileURL(file_info.local_path);
  
  #if defined(OS_CHROMEOS)
    drive::util::MaybeSetDriveURL(profile_, file_info.file_path, &url);
  #endif
  
    if (url.is_empty())
      return;
  
    OpenURL(OpenURLParams(
        url, Referrer(), CURRENT_TAB, content::PAGE_TRANSITION_TYPED, false));
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, content::NotificationObserver implementation:
  
  void Browser::Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) {
    switch (type) {
      case chrome::NOTIFICATION_EXTENSION_UNLOADED: {
        if (window()->GetLocationBar())
          window()->GetLocationBar()->UpdatePageActions();
  
        const extensions::UnloadedExtensionInfo* extension_info =
            content::Details<extensions::UnloadedExtensionInfo>(details).ptr();
  
        // Close any tabs from the unloaded extension, unless it's terminated,
        // in which case let the sad tabs remain.
        if (extension_info->reason != extension_misc::UNLOAD_REASON_TERMINATE) {
          const Extension* extension = extension_info->extension;
          // Iterate backwards as we may remove items while iterating.
          for (int i = tab_strip_model_->count() - 1; i >= 0; --i) {
            WebContents* web_contents = tab_strip_model_->GetWebContentsAt(i);
            // Two cases are handled here:
            // - The scheme check is for when an extension page is loaded in a
            //   tab, e.g. chrome-extension://id/page.html.
            // - The extension_app check is for apps, which can have non-extension
            //   schemes, e.g. https://mail.google.com if you have the Gmail app
            //   installed.
            if ((web_contents->GetURL().SchemeIs(extensions::kExtensionScheme) &&
                 web_contents->GetURL().host() == extension->id()) ||
                (extensions::TabHelper::FromWebContents(
                     web_contents)->extension_app() == extension)) {
              tab_strip_model_->CloseWebContentsAt(i, TabStripModel::CLOSE_NONE);
            }
          }
        }
        break;
      }
  
      case chrome::NOTIFICATION_EXTENSION_PROCESS_TERMINATED: {
        Profile* profile = content::Source<Profile>(source).ptr();
        if (profile_->IsSameProfile(profile) && window()->GetLocationBar())
          window()->GetLocationBar()->InvalidatePageActions();
        break;
      }
  
      case chrome::NOTIFICATION_EXTENSION_UNINSTALLED:
      case chrome::NOTIFICATION_EXTENSION_LOADED:
        // During window creation on Windows we may end up calling into
        // SHAppBarMessage, which internally spawns a nested message loop. This
        // makes it possible for us to end up here before window creation has
        // completed, at which point window_ is NULL. See 94752 for details.
        if (window() && window()->GetLocationBar())
          window()->GetLocationBar()->UpdatePageActions();
        break;
  
  #if defined(ENABLE_THEMES)
      case chrome::NOTIFICATION_BROWSER_THEME_CHANGED:
        window()->UserChangedTheme();
        break;
  #endif
  
      case chrome::NOTIFICATION_WEB_CONTENT_SETTINGS_CHANGED: {
        WebContents* web_contents = content::Source<WebContents>(source).ptr();
        if (web_contents == tab_strip_model_->GetActiveWebContents()) {
          LocationBar* location_bar = window()->GetLocationBar();
          if (location_bar)
            location_bar->UpdateContentSettingsIcons();
        }
        break;
      }
  
      default:
        NOTREACHED() << "Got a notification we didn't register for.";
    }
  }
  
  void Browser::ModelChanged(const SearchModel::State& old_state,
                             const SearchModel::State& new_state) {
    if (SearchModel::ShouldChangeTopBarsVisibility(old_state, new_state))
      UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, Command and state updating (private):
  
  void Browser::OnDevToolsDisabledChanged() {
    if (profile_->GetPrefs()->GetBoolean(prefs::kDevToolsDisabled))
      content::DevToolsManager::GetInstance()->CloseAllClientHosts();
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, UI update coalescing and handling (private):
  
  void Browser::UpdateToolbar(bool should_restore_state) {
    window_->UpdateToolbar(tab_strip_model_->GetActiveWebContents(),
                           should_restore_state);
  }
  
  void Browser::UpdateSearchState(WebContents* contents) {
    if (chrome::IsInstantExtendedAPIEnabled())
      search_delegate_->OnTabActivated(contents);
  }
  
  void Browser::ScheduleUIUpdate(const WebContents* source,
                                 unsigned changed_flags) {
    if (!source)
      return;
  
    // Do some synchronous updates.
    if (changed_flags & content::INVALIDATE_TYPE_URL &&
        source == tab_strip_model_->GetActiveWebContents()) {
      // Only update the URL for the current tab. Note that we do not update
      // the navigation commands since those would have already been updated
      // synchronously by NavigationStateChanged.
      UpdateToolbar(false);
      changed_flags &= ~content::INVALIDATE_TYPE_URL;
    }
    if (changed_flags & content::INVALIDATE_TYPE_LOAD) {
      // Update the loading state synchronously. This is so the throbber will
      // immediately start/stop, which gives a more snappy feel. We want to do
      // this for any tab so they start & stop quickly.
      tab_strip_model_->UpdateWebContentsStateAt(
          tab_strip_model_->GetIndexOfWebContents(source),
          TabStripModelObserver::LOADING_ONLY);
      // The status bubble needs to be updated during INVALIDATE_TYPE_LOAD too,
      // but we do that asynchronously by not stripping INVALIDATE_TYPE_LOAD from
      // changed_flags.
    }
  
    if (changed_flags & content::INVALIDATE_TYPE_TITLE && !source->IsLoading()) {
      // To correctly calculate whether the title changed while not loading
      // we need to process the update synchronously. This state only matters for
      // the TabStripModel, so we notify the TabStripModel now and notify others
      // asynchronously.
      tab_strip_model_->UpdateWebContentsStateAt(
          tab_strip_model_->GetIndexOfWebContents(source),
          TabStripModelObserver::TITLE_NOT_LOADING);
    }
  
    // If the only updates were synchronously handled above, we're done.
    if (changed_flags == 0)
      return;
  
    // Save the dirty bits.
    scheduled_updates_[source] |= changed_flags;
  
    if (!chrome_updater_factory_.HasWeakPtrs()) {
      // No task currently scheduled, start another.
      base::MessageLoop::current()->PostDelayedTask(
          FROM_HERE,
          base::Bind(&Browser::ProcessPendingUIUpdates,
                     chrome_updater_factory_.GetWeakPtr()),
          base::TimeDelta::FromMilliseconds(kUIUpdateCoalescingTimeMS));
    }
  }
  
  void Browser::ProcessPendingUIUpdates() {
  #ifndef NDEBUG
    // Validate that all tabs we have pending updates for exist. This is scary
    // because the pending list must be kept in sync with any detached or
    // deleted tabs.
    for (UpdateMap::const_iterator i = scheduled_updates_.begin();
         i != scheduled_updates_.end(); ++i) {
      bool found = false;
      for (int tab = 0; tab < tab_strip_model_->count(); tab++) {
        if (tab_strip_model_->GetWebContentsAt(tab) == i->first) {
          found = true;
          break;
        }
      }
      DCHECK(found);
    }
  #endif
  
    chrome_updater_factory_.InvalidateWeakPtrs();
  
    for (UpdateMap::const_iterator i = scheduled_updates_.begin();
         i != scheduled_updates_.end(); ++i) {
      // Do not dereference |contents|, it may be out-of-date!
      const WebContents* contents = i->first;
      unsigned flags = i->second;
  
      if (contents == tab_strip_model_->GetActiveWebContents()) {
        // Updates that only matter when the tab is selected go here.
  
        if (flags & content::INVALIDATE_TYPE_PAGE_ACTIONS) {
          LocationBar* location_bar = window()->GetLocationBar();
          if (location_bar)
            location_bar->UpdatePageActions();
        }
        // Updating the URL happens synchronously in ScheduleUIUpdate.
        if (flags & content::INVALIDATE_TYPE_LOAD && GetStatusBubble()) {
          GetStatusBubble()->SetStatus(CoreTabHelper::FromWebContents(
              tab_strip_model_->GetActiveWebContents())->GetStatusText());
        }
  
        if (flags & (content::INVALIDATE_TYPE_TAB |
                     content::INVALIDATE_TYPE_TITLE)) {
          window_->UpdateTitleBar();
        }
      }
  
      // Updates that don't depend upon the selected state go here.
      if (flags &
          (content::INVALIDATE_TYPE_TAB | content::INVALIDATE_TYPE_TITLE)) {
        tab_strip_model_->UpdateWebContentsStateAt(
            tab_strip_model_->GetIndexOfWebContents(contents),
            TabStripModelObserver::ALL);
      }
  
      // Update the bookmark bar. It may happen that the tab is crashed, and if
      // so, the bookmark bar should be hidden.
      if (flags & content::INVALIDATE_TYPE_TAB)
        UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
  
      // We don't need to process INVALIDATE_STATE, since that's not visible.
    }
  
    scheduled_updates_.clear();
  }
  
  void Browser::RemoveScheduledUpdatesFor(WebContents* contents) {
    if (!contents)
      return;
  
    UpdateMap::iterator i = scheduled_updates_.find(contents);
    if (i != scheduled_updates_.end())
      scheduled_updates_.erase(i);
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, Getters for UI (private):
  
  StatusBubble* Browser::GetStatusBubble() {
    // In kiosk and exclusive app mode, we want to always hide the status bubble.
    if (chrome::IsRunningInAppMode())
      return NULL;
  
    return window_ ? window_->GetStatusBubble() : NULL;
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, Session restore functions (private):
  
  void Browser::SyncHistoryWithTabs(int index) {
    SessionService* session_service =
        SessionServiceFactory::GetForProfileIfExisting(profile());
    if (session_service) {
      for (int i = index; i < tab_strip_model_->count(); ++i) {
        WebContents* web_contents = tab_strip_model_->GetWebContentsAt(i);
        if (web_contents) {
          SessionTabHelper* session_tab_helper =
              SessionTabHelper::FromWebContents(web_contents);
          session_service->SetTabIndexInWindow(
              session_id(), session_tab_helper->session_id(), i);
          session_service->SetPinnedState(
              session_id(),
              session_tab_helper->session_id(),
              tab_strip_model_->IsTabPinned(i));
        }
      }
    }
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, In-progress download termination handling (private):
  
  bool Browser::CanCloseWithInProgressDownloads() {
    // If we've prompted, we need to hear from the user before we
    // can close.
    if (cancel_download_confirmation_state_ != NOT_PROMPTED)
      return cancel_download_confirmation_state_ != WAITING_FOR_RESPONSE;
  
    int num_downloads_blocking;
    if (DOWNLOAD_CLOSE_OK ==
        OkToCloseWithInProgressDownloads(&num_downloads_blocking))
      return true;
  
    // Closing this window will kill some downloads; prompt to make sure
    // that's ok.
    cancel_download_confirmation_state_ = WAITING_FOR_RESPONSE;
    window_->ConfirmBrowserCloseWithPendingDownloads();
  
    // Return false so the browser does not close.  We'll close if the user
    // confirms in the dialog.
    return false;
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Browser, Assorted utility functions (private):
  
  void Browser::SetAsDelegate(WebContents* web_contents, Browser* delegate) {
    // WebContents...
    web_contents->SetDelegate(delegate);
  
    // ...and all the helpers.
    BlockedContentTabHelper::FromWebContents(web_contents)->
        set_delegate(delegate);
    BookmarkTabHelper::FromWebContents(web_contents)->set_delegate(delegate);
    WebContentsModalDialogManager::FromWebContents(web_contents)->
        set_delegate(delegate);
    CoreTabHelper::FromWebContents(web_contents)->set_delegate(delegate);
    SearchEngineTabHelper::FromWebContents(web_contents)->set_delegate(delegate);
    ZoomController::FromWebContents(web_contents)->set_observer(delegate);
  }
  
  void Browser::CloseFrame() {
    window_->Close();
  }
  
  void Browser::TabDetachedAtImpl(content::WebContents* contents,
                                  int index,
                                  DetachType type) {
    if (type == DETACH_TYPE_DETACH) {
      // Save the current location bar state, but only if the tab being detached
      // is the selected tab.  Because saving state can conditionally revert the
      // location bar, saving the current tab's location bar state to a
      // non-selected tab can corrupt both tabs.
      if (contents == tab_strip_model_->GetActiveWebContents()) {
        LocationBar* location_bar = window()->GetLocationBar();
        if (location_bar)
          location_bar->SaveStateToContents(contents);
      }
  
      if (!tab_strip_model_->closing_all())
        SyncHistoryWithTabs(0);
    }
  
    SetAsDelegate(contents, NULL);
    RemoveScheduledUpdatesFor(contents);
  
    if (find_bar_controller_.get() && index == tab_strip_model_->active_index()) {
      find_bar_controller_->ChangeWebContents(NULL);
    }
  
    // Stop observing search model changes for this tab.
    search_delegate_->OnTabDetached(contents);
  
    for (size_t i = 0; i < interstitial_observers_.size(); i++) {
      if (interstitial_observers_[i]->web_contents() != contents)
        continue;
  
      delete interstitial_observers_[i];
      interstitial_observers_.erase(interstitial_observers_.begin() + i);
      return;
    }
  }
  
  bool Browser::SupportsWindowFeatureImpl(WindowFeature feature,
                                          bool check_fullscreen) const {
    bool hide_ui_for_fullscreen = check_fullscreen && ShouldHideUIForFullscreen();
  
    unsigned int features = FEATURE_INFOBAR | FEATURE_DOWNLOADSHELF;
  
    if (is_type_tabbed())
      features |= FEATURE_BOOKMARKBAR;
  
    if (!hide_ui_for_fullscreen) {
      if (!is_type_tabbed())
        features |= FEATURE_TITLEBAR;
  
      if (is_type_tabbed())
        features |= FEATURE_TABSTRIP;
  
      if (is_type_tabbed())
        features |= FEATURE_TOOLBAR;
  
      if (!is_app())
        features |= FEATURE_LOCATIONBAR;
    }
    return !!(features & feature);
  }
  
  void Browser::UpdateBookmarkBarState(BookmarkBarStateChangeReason reason) {
    BookmarkBar::State state;
    // The bookmark bar is hidden in fullscreen mode, unless on the new tab page.
    if (browser_defaults::bookmarks_enabled &&
        profile_->GetPrefs()->GetBoolean(prefs::kShowBookmarkBar) &&
        !ShouldHideUIForFullscreen()) {
      state = BookmarkBar::SHOW;
    } else {
      WebContents* web_contents = tab_strip_model_->GetActiveWebContents();
      BookmarkTabHelper* bookmark_tab_helper =
          web_contents ? BookmarkTabHelper::FromWebContents(web_contents) : NULL;
      if (bookmark_tab_helper && bookmark_tab_helper->ShouldShowBookmarkBar())
        state = BookmarkBar::DETACHED;
      else
        state = BookmarkBar::HIDDEN;
    }
  
    // Bookmark bar may need to be hidden for |SEARCH_SUGGESTIONS| and
    // |SEARCH_RESULTS| modes as per SearchBox API or Instant overlay or if it's
    // detached when origin is not |NTP|.
    // TODO(sail): remove conditional MACOSX flag when bookmark bar is actually
    // hidden on mac; for now, mac keeps the bookmark bar shown but changes its
    // z-order to stack it below contents.
  #if !defined(OS_MACOSX)
    if (search_model_->mode().is_search() &&
        ((state == BookmarkBar::DETACHED &&
          !search_model_->mode().is_origin_ntp()) ||
        !search_model_->top_bars_visible())) {
      state = BookmarkBar::HIDDEN;
    }
  #else
    // TODO(sail): remove this when the above block is enabled for mac.
    if (state == BookmarkBar::DETACHED && search_model_->mode().is_search() &&
        !search_model_->mode().is_origin_ntp()) {
      state = BookmarkBar::HIDDEN;
    }
  #endif  // !defined(OS_MACOSX)
  
    if (state == bookmark_bar_state_)
      return;
  
    bookmark_bar_state_ = state;
  
    if (!window_)
      return;  // This is called from the constructor when window_ is NULL.
  
    if (reason == BOOKMARK_BAR_STATE_CHANGE_TAB_SWITCH) {
      // Don't notify BrowserWindow on a tab switch as at the time this is invoked
      // BrowserWindow hasn't yet switched tabs. The BrowserWindow implementations
      // end up querying state once they process the tab switch.
      return;
    }
  
    bool shouldAnimate = reason == BOOKMARK_BAR_STATE_CHANGE_PREF_CHANGE;
    window_->BookmarkBarStateChanged(shouldAnimate ?
        BookmarkBar::ANIMATE_STATE_CHANGE :
        BookmarkBar::DONT_ANIMATE_STATE_CHANGE);
  }
  
  bool Browser::ShouldHideUIForFullscreen() const {
    // Windows and GTK remove the top controls in fullscreen, but Mac and Ash
    // keep the controls in a slide-down panel.
    return window_ && window_->ShouldHideUIForFullscreen();
  }
  
  bool Browser::MaybeCreateBackgroundContents(int route_id,
                                              WebContents* opener_web_contents,
                                              const string16& frame_name,
                                              const GURL& target_url) {
    GURL opener_url = opener_web_contents->GetURL();
    ExtensionService* extensions_service =
        extensions::ExtensionSystem::Get(profile_)->extension_service();
  
    if (!opener_url.is_valid() ||
        frame_name.empty() ||
        !extensions_service ||
        !extensions_service->is_ready())
      return false;
  
    // Only hosted apps have web extents, so this ensures that only hosted apps
    // can create BackgroundContents. We don't have to check for background
    // permission as that is checked in RenderMessageFilter when the CreateWindow
    // message is processed.
    const Extension* extension =
        extensions_service->extensions()->GetHostedAppByURL(
            ExtensionURLInfo(opener_url));
    if (!extension)
      return false;
  
    // No BackgroundContents allowed if BackgroundContentsService doesn't exist.
    BackgroundContentsService* service =
        BackgroundContentsServiceFactory::GetForProfile(profile_);
    if (!service)
      return false;
  
    // Ensure that we're trying to open this from the extension's process.
    SiteInstance* opener_site_instance = opener_web_contents->GetSiteInstance();
    extensions::ProcessMap* process_map = extensions_service->process_map();
    if (!opener_site_instance->GetProcess() ||
        !process_map->Contains(
            extension->id(), opener_site_instance->GetProcess()->GetID())) {
      return false;
    }
  
    // Only allow a single background contents per app.
    bool allow_js_access = extensions::BackgroundInfo::AllowJSAccess(extension);
    BackgroundContents* existing =
        service->GetAppBackgroundContents(ASCIIToUTF16(extension->id()));
    if (existing) {
      // For non-scriptable background contents, ignore the request altogether,
      // (returning true, so that a regular WebContents isn't created either).
      if (!allow_js_access)
        return true;
      // For scriptable background pages, if one already exists, close it (even
      // if it was specified in the manifest).
      DLOG(INFO) << "Closing existing BackgroundContents for " << opener_url;
      delete existing;
    }
  
    // If script access is not allowed, create the the background contents in a
    // new SiteInstance, so that a separate process is used.
    scoped_refptr<content::SiteInstance> site_instance =
        allow_js_access ?
        opener_site_instance :
        content::SiteInstance::Create(opener_web_contents->GetBrowserContext());
  
    // Passed all the checks, so this should be created as a BackgroundContents.
    BackgroundContents* contents =
        service->CreateBackgroundContents(site_instance.get(),
                                          route_id,
                                          profile_,
                                          frame_name,
                                          ASCIIToUTF16(extension->id()));
  
    // When a separate process is used, the original renderer cannot access the
    // new window later, thus we need to navigate the window now.
    if (contents && !allow_js_access) {
      contents->web_contents()->GetController().LoadURL(
          target_url,
          content::Referrer(),
          content::PAGE_TRANSITION_LINK,
          std::string());  // No extra headers.
    }
  
    return contents != NULL;
  }
  