Run Demuxer::GetMemoryUsage() on media thread

media/blink/webmediaplayer_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 223 matching lines @@
   // |ended_| state by clamping current time to duration upon |ended_|.
   void UpdatePausedTime();
 
   // Notifies |delegate_| that playback has started or was paused; also starts
   // or stops the memory usage reporting timer respectively.
   void NotifyPlaybackStarted();
   void NotifyPlaybackPaused();
 
   // Called at low frequency to tell external observers how much memory we're
   // using for video playback.  Called by |memory_usage_reporting_timer_|.
-  void ReportMemoryUsage();
+  // Memory usage reporting is done in two steps, because |demuxer_| must be
+  // accessed on the media thread.
+  void StartMemoryUsageReport();
+  void FinishMemoryUsageReport(int64_t demuxer_memory_usage);
 
   blink::WebLocalFrame* frame_;
 
   // TODO(hclam): get rid of these members and read from the pipeline directly.
   blink::WebMediaPlayer::NetworkState network_state_;
   blink::WebMediaPlayer::ReadyState ready_state_;
 
   // Preload state for when |data_source_| is created after setPreload().
   BufferedDataSource::Preload preload_;
 
@@ skipping 92 matching lines @@
   scoped_ptr<blink::WebContentDecryptionModuleResult> set_cdm_result_;
 
   scoped_ptr<RendererFactory> renderer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_