Add support for switching the audio output device for HTMLMediaElements.

media/base/audio_renderer_mixer_input.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.
 
 #ifndef MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_
 #define MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_
 
+#include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "media/base/audio_converter.h"
 #include "media/base/audio_renderer_sink.h"
+#include "url/gurl.h"
 
 namespace media {
 
 class AudioRendererMixer;
 
 class MEDIA_EXPORT AudioRendererMixerInput
     : NON_EXPORTED_BASE(public AudioRendererSink),
       public AudioConverter::InputCallback {
  public:
   typedef base::Callback<AudioRendererMixer*(
       const AudioParameters& params)> GetMixerCB;
   typedef base::Callback<void(const AudioParameters& params)> RemoveMixerCB;
 
   AudioRendererMixerInput(
       const GetMixerCB& get_mixer_cb, const RemoveMixerCB& remove_mixer_cb);
 
   // AudioRendererSink implementation.
   void Start() override;
   void Stop() override;
   void Play() override;
   void Pause() override;
   bool SetVolume(double volume) override;
+  void SwitchOutputDevice(const std::string& device_id,
+                          const GURL& security_origin,
+                          const base::Callback<void(int)>& callback) override;
   void Initialize(const AudioParameters& params,
                   AudioRendererSink::RenderCallback* renderer) override;
 
   // Called by AudioRendererMixer when an error occurs.
   void OnRenderError();
 
  protected:
   ~AudioRendererMixerInput() override;
 
  private:
@@ skipping 24 matching lines @@
 
   // Error callback for handing to AudioRendererMixer.
   const base::Closure error_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerInput);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_