Add support for switching the audio output device for HTMLMediaElements.

media/audio/audio_output_stream_sink.h

 // Copyright 2014 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_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_
 
+#include <string>
+
+#include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "media/audio/audio_io.h"
 #include "media/base/audio_renderer_sink.h"
 #include "media/base/media_export.h"
+#include "url/gurl.h"
 
 namespace media {
 
 // Wrapper which exposes the browser side audio interface (AudioOutputStream) as
 // if it were a renderer side audio interface (AudioRendererSink). Note: This
 // will not work for sandboxed renderers.
 //
 // TODO(dalecurtis): Delete this class once we have a proper mojo audio service;
 // tracked by http://crbug.com/425368
 class MEDIA_EXPORT AudioOutputStreamSink
     : NON_EXPORTED_BASE(public AudioRendererSink),
       public AudioOutputStream::AudioSourceCallback {
  public:
   AudioOutputStreamSink();
 
   // AudioRendererSink implementation.
   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;
 
   // AudioSourceCallback implementation.
   int OnMoreData(AudioBus* dest, uint32 total_bytes_delay) override;
   void OnError(AudioOutputStream* stream) override;
 
  private:
   ~AudioOutputStreamSink() override;
 
   // Helper methods for running AudioManager methods on the audio thread.
   void DoStart();
@@ skipping 24 matching lines @@
   // Lock and callback for forwarding OnMoreData() calls into Render() calls.
   base::Lock callback_lock_;
   RenderCallback* active_render_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputStreamSink);
 };
 
 }  // namepace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_