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

media/base/fake_audio_renderer_sink.h

Index: media/base/fake_audio_renderer_sink.h
diff --git a/media/base/fake_audio_renderer_sink.h b/media/base/fake_audio_renderer_sink.h
index c3c313ae531c83b0ab793ac6cb24ab90b2a52e06..1982ba3d37363c4fd1a50d9a7e1f5a5a3d03d47e 100644
--- a/media/base/fake_audio_renderer_sink.h
+++ b/media/base/fake_audio_renderer_sink.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_
 
+#include <string>
+
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 
@@ -30,6 +32,9 @@ class FakeAudioRendererSink : public AudioRendererSink {
   void Pause() override;
   void Play() override;
   bool SetVolume(double volume) override;
+  void SwitchOutputDevice(const std::string& device_id,
+                          const GURL& security_origin,
+                          const SwitchOutputDeviceCB& callback) override;
 
   // Attempts to call Render() on the callback provided to
   // Initialize() with |dest| and |audio_delay_milliseconds|.