Add IPC interface for switching the audio output device for a given audio stream in the browser.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 777 matching lines @@
       media_stream_manager,
       AudioMirroringManager::GetInstance(),
       BrowserMainLoop::GetInstance()->user_input_monitor()));
   // The AudioRendererHost needs to be available for lookup, so it's
   // stashed in a member variable.
   audio_renderer_host_ = new AudioRendererHost(
       GetID(),
       audio_manager,
       AudioMirroringManager::GetInstance(),
       media_internals,
-      media_stream_manager);
+      media_stream_manager,
+      browser_context->GetResourceContext()->GetMediaDeviceIDSalt());
   AddFilter(audio_renderer_host_.get());
   AddFilter(
       new MidiHost(GetID(), BrowserMainLoop::GetInstance()->midi_manager()));
   AddFilter(new VideoCaptureHost(media_stream_manager));
   AddFilter(new AppCacheDispatcherHost(
       storage_partition_impl_->GetAppCacheService(),
       GetID()));
   AddFilter(new ClipboardMessageFilter);
   AddFilter(new DOMStorageMessageFilter(
       storage_partition_impl_->GetDOMStorageContext()));
@@ skipping 1694 matching lines @@
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {
   audio_renderer_host()->GetOutputControllers(callback);
 }
 
 BluetoothDispatcherHost* RenderProcessHostImpl::GetBluetoothDispatcherHost() {
   return bluetooth_dispatcher_host_.get();
 }
 
 }  // namespace content