media::BindToLoop() is born, with example uses to slim down WebMediaPlayerProxy.

webkit/media/webmediaplayer_proxy.h

Index: webkit/media/webmediaplayer_proxy.h
diff --git a/webkit/media/webmediaplayer_proxy.h b/webkit/media/webmediaplayer_proxy.h
index 6c78d279dfe0f1f1d9873b8b9ec8bc57a29b8c07..9e6ca4ffe240ad0b417255214c27c030170eadb6 100644
--- a/webkit/media/webmediaplayer_proxy.h
+++ b/webkit/media/webmediaplayer_proxy.h
@@ -62,7 +62,6 @@ class WebMediaPlayerProxy
 
   // Methods for Filter -> WebMediaPlayerImpl communication.
   void Repaint();
-  void SetOpaque(bool opaque);
 
   // Methods for WebMediaPlayerImpl -> Filter communication.
   void Paint(SkCanvas* canvas, const gfx::Rect& dest_rect, uint8_t alpha);
@@ -74,13 +73,6 @@ class WebMediaPlayerProxy
 
   void AbortDataSource();
 
-  // Methods for Pipeline -> WebMediaPlayerImpl communication.
-  void PipelineSeekCallback(media::PipelineStatus status);
-  void PipelineEndedCallback(media::PipelineStatus status);
-  void PipelineErrorCallback(media::PipelineStatus error);
-  void PipelineBufferingStateCallback(
-      media::Pipeline::BufferingState buffering_state);
-
   // ChunkDemuxerClient implementation.
   virtual void DemuxerOpened(media::ChunkDemuxer* demuxer) OVERRIDE;
   virtual void DemuxerClosed() OVERRIDE;
@@ -125,23 +117,6 @@ class WebMediaPlayerProxy
   // Invoke |webmediaplayer_| to perform a repaint.
   void RepaintTask();
 
-  // Notify |webmediaplayer_| that a seek has finished.
-  void PipelineSeekTask(media::PipelineStatus status);
-
-  // Notify |webmediaplayer_| that the media has ended.
-  void PipelineEndedTask(media::PipelineStatus status);
-
-  // Notify |webmediaplayer_| that a pipeline error has occurred during
-  // playback.
-  void PipelineErrorTask(media::PipelineStatus error);
-
-  // Notify |webmediaplayer_| of buffering state changes.
-  void PipelineBufferingStateTask(
-      media::Pipeline::BufferingState buffering_state);
-
-  // Inform |webmediaplayer_| whether the video content is opaque.
-  void SetOpaqueTask(bool opaque);
-
   void DemuxerOpenedTask(const scoped_refptr<media::ChunkDemuxer>& demuxer);
   void DemuxerClosedTask();