Add support for the audio-output-device switching IPC mechanism to the renderer lower layers (media…

media/audio/audio_output_stream_sink.h

Index: media/audio/audio_output_stream_sink.h
diff --git a/media/audio/audio_output_stream_sink.h b/media/audio/audio_output_stream_sink.h
index c6f04a7dafd4ca4829eeadc5d0495088ab732763..feccd03bd08626712a897ea310a3e039348eca75 100644
--- a/media/audio/audio_output_stream_sink.h
+++ b/media/audio/audio_output_stream_sink.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
@@ -34,6 +36,10 @@ class MEDIA_EXPORT AudioOutputStreamSink
   void Pause() override;
   void Play() override;
   bool SetVolume(double volume) override;
+  void SwitchOutputDevice(
+      const std::string& device_id,
+      const GURL& security_origin,
+      scoped_ptr<SwitchOutputDeviceCallbackRunner> callback_runner) override;
 
   // AudioSourceCallback implementation.
   int OnMoreData(AudioBus* dest, uint32 total_bytes_delay) override;