Implements AudioMessageFilter as member in RenderThread

content/renderer/render_thread.h

Index: content/renderer/render_thread.h
===================================================================
--- content/renderer/render_thread.h	(revision 90366)
+++ content/renderer/render_thread.h	(working copy)
@@ -22,6 +22,7 @@
 #include "ui/gfx/native_widget_types.h"
 
 class AppCacheDispatcher;
+class AudioMessageFilter;
 class DBMessageFilter;
 class FilePath;
 class GpuChannelHost;
@@ -164,6 +165,10 @@
     return indexed_db_dispatcher_.get();
   }
 
+  AudioMessageFilter* audio_message_filter() {
+    return audio_message_filter_.get();
+  }
+
   bool plugin_refresh_allowed() const { return plugin_refresh_allowed_; }
 
   double idle_notification_delay_in_s() const {
@@ -246,6 +251,7 @@
 
   // Used on the renderer and IPC threads.
   scoped_refptr<DBMessageFilter> db_message_filter_;
+  scoped_refptr<AudioMessageFilter> audio_message_filter_;
 
   // Used on multiple script execution context threads.
   scoped_ptr<WebDatabaseObserverImpl> web_database_observer_impl_;