Implement MediaSession on top of the WebMediaPlayerDelegate.

chrome/browser/media/android/remote/remote_media_player_manager.h

Index: chrome/browser/media/android/remote/remote_media_player_manager.h
diff --git a/chrome/browser/media/android/remote/remote_media_player_manager.h b/chrome/browser/media/android/remote/remote_media_player_manager.h
index 47167c42eff94301fd14b23bdc1fee81a3de2455..be0b8e3ee3d26fc610dc967c0a9c5a2d4224613e 100644
--- a/chrome/browser/media/android/remote/remote_media_player_manager.h
+++ b/chrome/browser/media/android/remote/remote_media_player_manager.h
@@ -54,6 +54,8 @@ class RemoteMediaPlayerManager : public content::BrowserMediaPlayerManager {
 
   void ReleaseResources(int player_id) override;
 
+  bool IsPlayingRemotely(int player_id) override;
+
  private:
   // Returns a MediaPlayerAndroid implementation for playing the media remotely.
   RemoteMediaPlayerBridge* CreateRemoteMediaPlayer(
@@ -69,8 +71,6 @@ class RemoteMediaPlayerManager : public content::BrowserMediaPlayerManager {
       const MediaPlayerHostMsg_Initialize_Params& media_player_params) override;
   void OnDestroyPlayer(int player_id) override;
   void OnSuspendAndReleaseResources(int player_id) override;
-  void OnSuspend(int player_id) override;
-  void OnResume(int player_id) override;
   void OnRequestRemotePlayback(int player_id) override;
   void OnRequestRemotePlaybackControl(int player_id) override;
 
@@ -108,8 +108,6 @@ class RemoteMediaPlayerManager : public content::BrowserMediaPlayerManager {
   // for videos that are playing remotely.
   ScopedVector<media::MediaPlayerAndroid> alternative_players_;
 
-  bool IsPlayingRemotely(int player_id);
-
   std::set<int> players_playing_remotely_;
 
   base::WeakPtrFactory<RemoteMediaPlayerManager> weak_ptr_factory_;