Add support for switching the audio output device for HTMLMediaElements.

media/audio/clockless_audio_sink.h

Index: media/audio/clockless_audio_sink.h
diff --git a/media/audio/clockless_audio_sink.h b/media/audio/clockless_audio_sink.h
index 075c55a50d72285a88d143a57d55a8f1c3f4e5ba..1d1db626235b6b4da7e7995a4e18e6f838e39284 100644
--- a/media/audio/clockless_audio_sink.h
+++ b/media/audio/clockless_audio_sink.h
@@ -5,9 +5,12 @@
 #ifndef MEDIA_AUDIO_CLOCKLESS_AUDIO_SINK_H_
 #define MEDIA_AUDIO_CLOCKLESS_AUDIO_SINK_H_
 
+#include <string>
+
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "media/base/audio_renderer_sink.h"
+#include "url/gurl.h"
 
 namespace base {
 class SingleThreadTaskRunner;
@@ -32,6 +35,9 @@ class MEDIA_EXPORT ClocklessAudioSink
   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;
 
   // Returns the time taken to consume all the audio.
   base::TimeDelta render_time() { return playback_time_; }