Enable seek in fullscreen mode for MSE impl on android

media/base/android/media_player_manager.h

 // Copyright (c) 2012 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 MEDIA_BASE_ANDROID_MEDIA_PLAYER_MANAGER_H_
 #define MEDIA_BASE_ANDROID_MEDIA_PLAYER_MANAGER_H_
 
 #include "base/time.h"
 #include "media/base/media_export.h"
 #include "media/base/android/demuxer_stream_player_params.h"
@@ skipping 50 matching lines @@
 
   // Called when error happens. Args: player ID, error type.
   virtual void OnError(int player_id, int error) = 0;
 
   // Called when video size has changed. Args: player ID, width, height.
   virtual void OnVideoSizeChanged(int player_id, int width, int height) = 0;
 
   // Callback when DemuxerStreamPlayer wants to read data from the demuxer.
   virtual void OnReadFromDemuxer(
       int player_id, media::DemuxerStream::Type type, bool seek_done) = 0;
+
+  // Called when player wants the media element to initiate a seek.
+  virtual void OnMediaSeekRequest(int player_id,
+                                  base::TimeDelta time_to_seek) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_PLAYER_MANAGER_H_