Add support for switching the audio output device for HTMLMediaElements.

media/base/fake_audio_renderer_sink.h

 // 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.
 
 #ifndef MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_
 
+#include <string>
+
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
+#include "url/gurl.h"
 
 namespace media {
 
 class FakeAudioRendererSink : public AudioRendererSink {
  public:
   enum State {
     kUninitialized,
     kInitialized,
     kStarted,
     kPaused,
     kPlaying,
     kStopped
   };
 
   FakeAudioRendererSink();
 
   void Initialize(const AudioParameters& params,
                   RenderCallback* callback) override;
   void Start() override;
   void Stop() override;
   void Pause() override;
   void Play() override;
   bool SetVolume(double volume) override;
+  void SwitchOutputDevice(const std::string& device_id,
+                          const GURL& security_origin,
+                          const base::Callback<void(int)>& callback) override;
+
 
   // Attempts to call Render() on the callback provided to
   // Initialize() with |dest| and |audio_delay_milliseconds|.
   // Returns true and sets |frames_written| to the return value of the
   // Render() call.
   // Returns false if this object is in a state where calling Render()
   // should not occur. (i.e., in the kPaused or kStopped state.) The
   // value of |frames_written| is undefined if false is returned.
   bool Render(AudioBus* dest, int audio_delay_milliseconds,
               int* frames_written);
   void OnRenderError();
 
   State state() const { return state_; }
 
  protected:
   ~FakeAudioRendererSink() override;
 
  private:
   void ChangeState(State new_state);
 
   State state_;
   RenderCallback* callback_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioRendererSink);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_