Enable seek in fullscreen mode for MSE impl on android

content/common/media/media_player_messages_android.h

Index: content/common/media/media_player_messages_android.h
diff --git a/content/common/media/media_player_messages_android.h b/content/common/media/media_player_messages_android.h
index 30755fbf03d43bec1c05735d10396e17bfe56894..99c62e2aa564ac2345d63a4be2d66432ba633126 100644
--- a/content/common/media/media_player_messages_android.h
+++ b/content/common/media/media_player_messages_android.h
@@ -121,6 +121,12 @@ IPC_MESSAGE_ROUTED1(MediaPlayerMsg_DidMediaPlayerPlay,
 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 */,
@@ -168,6 +174,10 @@ IPC_MESSAGE_ROUTED1(MediaPlayerHostMsg_EnterFullscreen,
 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 */,