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

media/base/mock_audio_renderer_sink.h

Index: media/base/mock_audio_renderer_sink.h
diff --git a/media/base/mock_audio_renderer_sink.h b/media/base/mock_audio_renderer_sink.h
index 3a85d528a033a779827c0217e691c145ae230df6..b813257601a9921fcf5275521f94b5e7e7b1bc5c 100644
--- a/media/base/mock_audio_renderer_sink.h
+++ b/media/base/mock_audio_renderer_sink.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_BASE_MOCK_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_MOCK_AUDIO_RENDERER_SINK_H_
 
+#include <string>
+
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -20,6 +22,12 @@ class MockAudioRendererSink : public AudioRendererSink {
   MOCK_METHOD0(Pause, void());
   MOCK_METHOD0(Play, void());
   MOCK_METHOD1(SetVolume, bool(double volume));
+  MOCK_METHOD0(SwitchOutputDevice, void());
+  void SwitchOutputDevice(const std::string&,
+                          const GURL& security_origin,
+                          const SwitchOutputDeviceCB& callback) override {
+    SwitchOutputDevice();
+  }
 
   void Initialize(const AudioParameters& params,
                   RenderCallback* renderer) override;