Add support for switching the audio output device for HTMLMediaElements.

content/renderer/media/webrtc_local_audio_renderer.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 CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_RENDERER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_RENDERER_H_
 
+#include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/media/media_stream_audio_renderer.h"
@@ skipping 37 matching lines @@
                            int session_id,
                            int frames_per_buffer);
 
   // MediaStreamAudioRenderer implementation.
   // Called on the main thread.
   void Start() override;
   void Stop() override;
   void Play() override;
   void Pause() override;
   void SetVolume(float volume) override;
+  void SwitchOutputDevice(const std::string& device_id,
+                          const GURL& security_origin,
+                          const base::Callback<void(int)>& callback) override;
   base::TimeDelta GetCurrentRenderTime() const override;
   bool IsLocalRenderer() const override;
 
   const base::TimeDelta& total_render_time() const {
     return total_render_time_;
   }
 
  protected:
   ~WebRtcLocalAudioRenderer() override;
 
@@ skipping 83 matching lines @@
 
   // Used to DCHECK that some methods are called on the capture audio thread.
   base::ThreadChecker capture_thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRtcLocalAudioRenderer);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_RENDERER_H_