Enable seek in fullscreen mode for MSE impl on android

content/renderer/media/webmediaplayer_proxy_impl_android.cc

Index: content/renderer/media/webmediaplayer_proxy_impl_android.cc
diff --git a/content/renderer/media/webmediaplayer_proxy_impl_android.cc b/content/renderer/media/webmediaplayer_proxy_impl_android.cc
index f4e16365c269f7d76659cc78ad07c7ec87de56ca..7b04b853a2e9143d39d4dfa0472e8c9328f73519 100644
--- a/content/renderer/media/webmediaplayer_proxy_impl_android.cc
+++ b/content/renderer/media/webmediaplayer_proxy_impl_android.cc
@@ -45,6 +45,7 @@ bool WebMediaPlayerProxyImplAndroid::OnMessageReceived(
     IPC_MESSAGE_HANDLER(MediaPlayerMsg_DidMediaPlayerPlay, OnPlayerPlay)
     IPC_MESSAGE_HANDLER(MediaPlayerMsg_DidMediaPlayerPause, OnPlayerPause)
     IPC_MESSAGE_HANDLER(MediaPlayerMsg_ReadFromDemuxer, OnReadFromDemuxer)
+    IPC_MESSAGE_HANDLER(MediaPlayerMsg_MediaSeekRequest, OnMediaSeekRequest)
   IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -217,4 +218,14 @@ webkit_media::WebMediaPlayerAndroid*
       manager_->GetMediaPlayer(player_id));
 }
 
+void WebMediaPlayerProxyImplAndroid::OnMediaSeekRequest(
+    int player_id, base::TimeDelta time_to_seek) {
+  webkit_media::WebMediaPlayerAndroid* player = GetWebMediaPlayer(player_id);
+  if (player) {
+    Send(new MediaPlayerHostMsg_MediaSeekRequestAck(routing_id(), player_id));
+    player->OnMediaSeekRequest(time_to_seek);
+  }
+}
+
+
 }  // namespace content