text: // Copyright 2014 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.
  
  #ifndef IOS_CHROME_BROWSER_UI_RECENT_TABS_CLOSED_TABS_OBSERVER_BRIDGE_H_
  #define IOS_CHROME_BROWSER_UI_RECENT_TABS_CLOSED_TABS_OBSERVER_BRIDGE_H_
  
  #import <UIKit/UIKit.h>
  
  #include "base/macros.h"
  #include "components/sessions/core/tab_restore_service_observer.h"
  
  // Objective-C protocol equivalent of the sessions::TabRestoreServiceObserver
  // C++ class. Those methods are called through the bridge. The method names are
  // the same as the C++ ones.
  @protocol ClosedTabsObserving<NSObject>
  - (void)tabRestoreServiceChanged:(sessions::TabRestoreService*)service;
  - (void)tabRestoreServiceDestroyed:(sessions::TabRestoreService*)service;
  @end
  
  namespace recent_tabs {
  
  // Bridge class to forward events from the sessions::TabRestoreService to
  // Objective-C protocol ClosedTabsObserving.
  class ClosedTabsObserverBridge : public sessions::TabRestoreServiceObserver {
   public:
    explicit ClosedTabsObserverBridge(id<ClosedTabsObserving> owner);
  
    ClosedTabsObserverBridge(const ClosedTabsObserverBridge&) = delete;
    ClosedTabsObserverBridge& operator=(const ClosedTabsObserverBridge&) = delete;
  
    ~ClosedTabsObserverBridge() override;
  
    // sessions::TabRestoreServiceObserver implementation.
    void TabRestoreServiceChanged(sessions::TabRestoreService* service) override;
    void TabRestoreServiceDestroyed(
        sessions::TabRestoreService* service) override;
  
   private:
    __weak id<ClosedTabsObserving> owner_;
  };
  
  }  // namespace recent_tabs
  
  #endif  // IOS_CHROME_BROWSER_UI_RECENT_TABS_CLOSED_TABS_OBSERVER_BRIDGE_H_
  