Enable seek in fullscreen mode for MSE impl on android

content/common/media/media_player_messages_android.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.
 
 // IPC messages for android media player.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 
 #include "base/time.h"
@@ skipping 103 matching lines @@
                     int /* player_id */)
 
 // The player started playing.
 IPC_MESSAGE_ROUTED1(MediaPlayerMsg_DidMediaPlayerPlay,
                     int /* player_id */)
 
 // The player was paused.
 IPC_MESSAGE_ROUTED1(MediaPlayerMsg_DidMediaPlayerPause,
                     int /* player_id */)
 
+// Media seek is requested.
+IPC_MESSAGE_ROUTED3(MediaPlayerMsg_MediaSeekRequest,
+                    int /* player_id */,
+                    base::TimeDelta /* time_to_seek */,
+                    bool /* request_texture_peer */)
+
 // The media source player reads data from demuxer
 IPC_MESSAGE_ROUTED3(MediaPlayerMsg_ReadFromDemuxer,
                     int /* player_id */,
                     media::DemuxerStream::Type /* type */,
                     bool /* seek_done */)
 
 // Messages for controllering the media playback in browser process ----------
 
 // Destroy the media player object.
 IPC_MESSAGE_ROUTED1(MediaPlayerHostMsg_DestroyMediaPlayer,
@@ skipping 27 matching lines @@
                     int /* player_id */)
 
 // Request the player to enter fullscreen.
 IPC_MESSAGE_ROUTED1(MediaPlayerHostMsg_EnterFullscreen,
                     int /* player_id */)
 
 // Request the player to exit fullscreen.
 IPC_MESSAGE_ROUTED1(MediaPlayerHostMsg_ExitFullscreen,
                     int /* player_id */)
 
+// Sent when the seek request is received by the WebMediaPlayerAndroid.
+IPC_MESSAGE_ROUTED1(MediaPlayerHostMsg_MediaSeekRequestAck,
+                    int /* player_id */)
+
 // Inform the media source player that the demuxer is ready.
 IPC_MESSAGE_ROUTED2(MediaPlayerHostMsg_DemuxerReady,
                     int /* player_id */,
                     media::MediaPlayerHostMsg_DemuxerReady_Params)
 
 // Sent when the data was read from the ChunkDemuxer.
 IPC_MESSAGE_ROUTED2(MediaPlayerHostMsg_ReadFromDemuxerAck,
                     int /* player_id */,
                     media::MediaPlayerHostMsg_ReadFromDemuxerAck_Params)
 
 #if defined(GOOGLE_TV)
 // Notify the player about the external surface, requesting it if necessary.
 IPC_MESSAGE_ROUTED3(MediaPlayerHostMsg_NotifyExternalSurface,
                     int /* player_id */,
                     bool /* is_request */,
                     gfx::RectF /* rect */)
 
 #endif