Avoid flooding main thread by caching state on media thread.

media/base/pipeline_impl.h

Index: media/base/pipeline_impl.h
diff --git a/media/base/pipeline_impl.h b/media/base/pipeline_impl.h
index beb0b010492b908fc56ffcbc6de193779f045ac2..45b4454c5ce1e220652a6696ad802f3a4924e4b9 100644
--- a/media/base/pipeline_impl.h
+++ b/media/base/pipeline_impl.h
@@ -128,8 +128,6 @@ class MEDIA_EXPORT PipelineImpl : public Pipeline {
   void OnWaitingForDecryptionKey();
   void OnVideoNaturalSizeChange(const gfx::Size& size);
   void OnVideoOpacityChange(bool opaque);
-  void OnBufferedTimeRangesChange(const Ranges<base::TimeDelta>& ranges);
-  void OnStatisticsUpdate(const PipelineStatistics& stats);
 
   // Task completion callbacks from RendererWrapper.
   void OnSeekDone(base::TimeDelta start_time);
@@ -161,19 +159,9 @@ class MEDIA_EXPORT PipelineImpl : public Pipeline {
   // filters.
   float volume_;
 
-  // Amount of available buffered data as reported by Demuxer.
-  Ranges<base::TimeDelta> buffered_time_ranges_;
-
   // Current duration as reported by Demuxer.
   base::TimeDelta duration_;
 
-  // True when OnBufferedTimeRangesChange() has been called more recently than
-  // DidLoadingProgress().
-  bool did_loading_progress_;
-
-  // Accumulated statistics reported by the renderer.
-  PipelineStatistics statistics_;
-
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<PipelineImpl> weak_factory_;