Part 1: Plumb render view ID to render host

content/renderer/media/render_audiosourceprovider.h

 // Copyright (c) 2012 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.
 //
 // RenderAudioSourceProvider provides a bridge between classes:
 //     WebKit::WebAudioSourceProvider <---> media::AudioRendererSink
 //
 // RenderAudioSourceProvider is a "sink" of audio, and uses a default
 // AudioOutputDevice if a client has not explicitly been set.
 //
@@ skipping 19 matching lines @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProvider.h"
 
 namespace WebKit {
 class WebAudioSourceProviderClient;
 }
 
 class RenderAudioSourceProvider
     : public WebKit::WebAudioSourceProvider,
       public media::AudioRendererSink {
  public:
-  RenderAudioSourceProvider();
+  RenderAudioSourceProvider(int render_view_id);
 
   // WebKit::WebAudioSourceProvider implementation.
 
   // WebKit calls setClient() if it desires to take control of the rendered
   // audio stream.  We call client's setFormat() when the audio stream format
   // is known.
   virtual void setClient(WebKit::WebAudioSourceProviderClient* client);
 
   // If setClient() has been called, then WebKit calls provideInput()
   // periodically to get the rendered audio stream.
@@ skipping 26 matching lines @@
   // Protects access to sink_
   base::Lock sink_lock_;
 
   // default_sink_ is the default sink.
   scoped_refptr<media::AudioRendererSink> default_sink_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderAudioSourceProvider);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_RENDER_AUDIOSOURCEPROVIDER_H_