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 OnMediaDestroyedNotification(RenderFrameHost* render_frame_host,
+                                    int64_t player_cookie);
   void OnMediaPlayingNotification(RenderFrameHost* render_frame_host,
                                   int64_t player_cookie,
                                   bool has_video,
                                   bool has_audio,
-                                  bool is_remote);
+                                  bool is_remote,
+                                  base::TimeDelta duration);
   void OnMediaPausedNotification(RenderFrameHost* render_frame_host,
-                                 int64_t player_cookie);
+                                 int64_t player_cookie,
+                                 bool reached_end_of_stream);
 
   // 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_|
@@ skipping 19 matching lines @@
   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_