Prime the landing pad for the new video rendering pipeline.

media/mojo/services/mojo_renderer_service.h

Index: media/mojo/services/mojo_renderer_service.h
diff --git a/media/mojo/services/mojo_renderer_service.h b/media/mojo/services/mojo_renderer_service.h
index 2046e9d8d19812a5608f4bc4d7f237f76a60bcc8..6003515befb6e41a129847559bc93181e7f748ec 100644
--- a/media/mojo/services/mojo_renderer_service.h
+++ b/media/mojo/services/mojo_renderer_service.h
@@ -27,6 +27,7 @@ namespace media {
 class AudioRendererSink;
 class DemuxerStreamProviderShim;
 class Renderer;
+class VideoRendererSink;
 
 // A mojo::MediaRenderer implementation that uses media::AudioRenderer to
 // decode and render audio to a sink obtained from the ApplicationConnection.
@@ -89,6 +90,7 @@ class MEDIA_EXPORT MojoRendererService
   State state_;
 
   scoped_refptr<AudioRendererSink> audio_renderer_sink_;
+  scoped_ptr<VideoRendererSink> video_renderer_sink_;
   scoped_ptr<Renderer> renderer_;
   scoped_ptr<DemuxerStreamProviderShim> stream_provider_;