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

media/base/pipeline_status.h

Index: media/base/pipeline_status.h
diff --git a/media/base/pipeline_status.h b/media/base/pipeline_status.h
index daec9237988e7c809b3e3d572e529c4f09100c60..e179a05aa178d9eda0dbb180866d1cb3546485d0 100644
--- a/media/base/pipeline_status.h
+++ b/media/base/pipeline_status.h
@@ -44,13 +44,16 @@ struct PipelineStatistics {
       : audio_bytes_decoded(0),
         video_bytes_decoded(0),
         video_frames_decoded(0),
-        video_frames_dropped(0) {
-  }
+        video_frames_dropped(0),
+        audio_memory_usage(-1),
+        video_memory_usage(-1) {}
 
   uint32 audio_bytes_decoded;  // Should be uint64?
   uint32 video_bytes_decoded;  // Should be uint64?
   uint32 video_frames_decoded;
   uint32 video_frames_dropped;
+  int64_t audio_memory_usage;
+  int64_t video_memory_usage;
 };
 
 // Used for updating pipeline statistics.