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

media/audio/fake_audio_log_factory.cc

 // Copyright 2013 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 "media/audio/fake_audio_log_factory.h"
 
+#include <string>
+
 namespace media {
 
 class FakeAudioLogImpl : public AudioLog {
  public:
   FakeAudioLogImpl() {}
   ~FakeAudioLogImpl() override {}
   void OnCreated(int component_id,
                  const media::AudioParameters& params,
                  const std::string& device_id) override {}
   void OnStarted(int component_id) override {}
   void OnStopped(int component_id) override {}
   void OnClosed(int component_id) override {}
   void OnError(int component_id) override {}
   void OnSetVolume(int component_id, double volume) override {}
+  void OnSwitchOutputDevice(int component_id,
+                            const std::string& device_id) override {}
 };
 
 FakeAudioLogFactory::FakeAudioLogFactory() {}
 FakeAudioLogFactory::~FakeAudioLogFactory() {}
 
 scoped_ptr<AudioLog> FakeAudioLogFactory::CreateAudioLog(
     AudioComponent component) {
   return scoped_ptr<AudioLog>(new FakeAudioLogImpl());
 }
 
 }  // namespace media