Enable seek in fullscreen mode for MSE impl on android

content/browser/android/media_player_manager_impl.h

Index: content/browser/android/media_player_manager_impl.h
diff --git a/content/browser/android/media_player_manager_impl.h b/content/browser/android/media_player_manager_impl.h
index 7c076794368b13e63c06ee92bc64dfbb42ec16a5..af6664caf56b782ca7fd3b234c3333d9a659874b 100644
--- a/content/browser/android/media_player_manager_impl.h
+++ b/content/browser/android/media_player_manager_impl.h
@@ -72,6 +72,8 @@ class MediaPlayerManagerImpl
   virtual void ReleaseMediaResources(
       media::MediaPlayerAndroid* player) OVERRIDE;
   virtual media::MediaResourceGetter* GetMediaResourceGetter() OVERRIDE;
+  virtual void OnMediaSeekRequest(int player_id, base::TimeDelta time_to_seek)
+      OVERRIDE;
 
   // Release all the players managed by this object.
   void DestroyAllMediaPlayers();
@@ -102,6 +104,7 @@ class MediaPlayerManagerImpl
   void OnReadFromDemuxerAck(
       int player_id,
       const media::MediaPlayerHostMsg_ReadFromDemuxerAck_Params& params);
+  void OnMediaSeekRequestAck(int player_id);
 
 #if defined(GOOGLE_TV)
   void OnNotifyExternalSurface(