Implement MediaSession on top of the WebMediaPlayerDelegate.

content/browser/media/media_web_contents_observer.h

 // 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 CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 30 matching lines @@
 
   bool has_audio_power_save_blocker_for_testing() const {
     return !!audio_power_save_blocker_;
   }
 
   bool has_video_power_save_blocker_for_testing() const {
     return !!video_power_save_blocker_;
   }
 
  private:
-  void OnMediaPlayingNotification(RenderFrameHost* render_frame_host,
-                                  int64_t player_cookie,
-                                  bool has_video,
-                                  bool has_audio,
-                                  bool is_remote);
-  void OnMediaPausedNotification(RenderFrameHost* render_frame_host,
-                                 int64_t player_cookie);
+  void OnMediaDestroyed(RenderFrameHost* render_frame_host, int delegate_id);
+  void OnMediaPaused(RenderFrameHost* render_frame_host,
+                     int delegate_id,
+                     bool reached_end_of_stream);
+  void OnMediaPlaying(RenderFrameHost* render_frame_host,
+                      int delegate_id,
+                      bool has_video,
+                      bool has_audio,
+                      bool is_remote,
+                      base::TimeDelta duration);
 
   // Clear |render_frame_host|'s tracking entry for its power save blockers.
   void ClearPowerSaveBlockers(RenderFrameHost* render_frame_host);
 
   // Creates an audio or video power save blocker respectively.
   void CreateAudioPowerSaveBlocker();
   void CreateVideoPowerSaveBlocker();
 
   // Releases the audio power save blockers if |active_audio_players_| is empty.
   // Likewise, releases the video power save blockers if |active_video_players_|
   // is empty.
   void MaybeReleasePowerSaveBlockers();
 
   // Helper methods for adding or removing player entries in |player_map|.
-  using PlayerList = std::vector<int64_t>;
+  using PlayerList = std::vector<int>;
   using ActiveMediaPlayerMap = std::map<RenderFrameHost*, PlayerList>;
   void AddMediaPlayerEntry(const MediaPlayerId& id,
                            ActiveMediaPlayerMap* player_map);
   // Returns true if an entry is actually removed.
   bool RemoveMediaPlayerEntry(const MediaPlayerId& id,
                               ActiveMediaPlayerMap* player_map);
   // Removes all entries from |player_map| for |render_frame_host|. Removed
   // entries are added to |removed_players|.
   void RemoveAllMediaPlayerEntries(RenderFrameHost* render_frame_host,
                                    ActiveMediaPlayerMap* player_map,
                                    std::set<MediaPlayerId>* removed_players);
 
   // Tracking variables and associated power save blockers for media playback.
   ActiveMediaPlayerMap active_audio_players_;
   ActiveMediaPlayerMap active_video_players_;
   scoped_ptr<PowerSaveBlocker> audio_power_save_blocker_;
   scoped_ptr<PowerSaveBlocker> video_power_save_blocker_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_