Add methods for telling V8 how much memory audio/video is using.

media/renderers/audio_renderer_impl.h

Index: media/renderers/audio_renderer_impl.h
diff --git a/media/renderers/audio_renderer_impl.h b/media/renderers/audio_renderer_impl.h
index 1c98c871934d2c83c26c89faf0944697c2547003..0d3418dad64f6ac9cd71d5f63ab1af32a01db51a 100644
--- a/media/renderers/audio_renderer_impl.h
+++ b/media/renderers/audio_renderer_impl.h
@@ -215,6 +215,7 @@ class MEDIA_EXPORT AudioRendererImpl
   BufferingStateCB buffering_state_cb_;
   base::Closure ended_cb_;
   PipelineStatusCB error_cb_;
+  StatisticsCB statistics_cb_;
 
   // Callback provided to Flush().
   base::Closure flush_cb_;
@@ -222,6 +223,10 @@ class MEDIA_EXPORT AudioRendererImpl
   // Overridable tick clock for testing.
   scoped_ptr<base::TickClock> tick_clock_;
 
+  // Memory usage of |algorithm_| recorded during the last
+  // HandleSplicerBuffer_Locked() call.
+  int64_t last_audio_memory_usage_;
+
   // After Initialize() has completed, all variables below must be accessed
   // under |lock_|. ------------------------------------------------------------
   base::Lock lock_;