Part 1: Plumb render view ID to render host

content/renderer/media/renderer_webaudiodevice_impl.cc

 // 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.
 
 #include "content/renderer/media/renderer_webaudiodevice_impl.h"
 
 #include "base/logging.h"
 #include "content/renderer/media/audio_device_factory.h"
 
 using content::AudioDeviceFactory;
 using WebKit::WebAudioDevice;
 using WebKit::WebVector;
 
 RendererWebAudioDeviceImpl::RendererWebAudioDeviceImpl(
+    int render_view_id,
     const media::AudioParameters& params,
     WebAudioDevice::RenderCallback* callback)
     : is_running_(false),
       client_callback_(callback) {
-  audio_device_ = AudioDeviceFactory::NewOutputDevice();
+  audio_device_ = AudioDeviceFactory::NewOutputDevice(render_view_id);
   audio_device_->Initialize(params, this);
 }
 
 RendererWebAudioDeviceImpl::~RendererWebAudioDeviceImpl() {
   stop();
 }
 
 void RendererWebAudioDeviceImpl::start() {
   if (!is_running_) {
     audio_device_->Start();
@@ skipping 24 matching lines @@
       web_audio_data[i] = audio_data[i];
 
     client_callback_->render(web_audio_data, number_of_frames);
   }
   return number_of_frames;
 }
 
 void RendererWebAudioDeviceImpl::OnRenderError() {
   // TODO(crogers): implement error handling.
 }