Add chromium support for MediaStreamAudioDestinationNode

content/renderer/media/media_stream_dependency_factory.h

Index: content/renderer/media/media_stream_dependency_factory.h
===================================================================
--- content/renderer/media/media_stream_dependency_factory.h	(revision 176961)
+++ content/renderer/media/media_stream_dependency_factory.h	(working copy)
@@ -12,6 +12,7 @@
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 #include "content/renderer/media/media_stream_extra_data.h"
+#include "content/renderer/media/webaudio_capturer_source.h"
 #include "content/renderer/p2p/socket_dispatcher.h"
 #include "third_party/libjingle/source/talk/app/webrtc/peerconnectioninterface.h"
 #include "third_party/libjingle/source/talk/app/webrtc/videosourceinterface.h"
@@ -177,6 +178,9 @@
   talk_base::Thread* worker_thread_;
   base::Thread chrome_worker_thread_;
 
+  // Handles audio from MediaStreamAudioDestinationNode.
+  scoped_refptr<WebAudioCapturerSource> webaudio_capturer_source_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDependencyFactory);
 };