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

media/base/fake_audio_renderer_sink.cc

Index: media/base/fake_audio_renderer_sink.cc
diff --git a/media/base/fake_audio_renderer_sink.cc b/media/base/fake_audio_renderer_sink.cc
index d42db6de1b9a7eba16f42c4417c56aa218112576..4c4233b5e08a25888fe3edc4655e05651dfde561 100644
--- a/media/base/fake_audio_renderer_sink.cc
+++ b/media/base/fake_audio_renderer_sink.cc
@@ -4,7 +4,10 @@
 
 #include "media/base/fake_audio_renderer_sink.h"
 
+#include "base/bind.h"
+#include "base/location.h"
 #include "base/logging.h"
+#include "base/single_thread_task_runner.h"
 
 namespace media {
 
@@ -52,6 +55,13 @@ bool FakeAudioRendererSink::SetVolume(double volume) {
   return true;
 }
 
+void FakeAudioRendererSink::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const SwitchOutputDeviceCB& callback) {
+  callback.Run(SWITCH_OUTPUT_DEVICE_RESULT_SUCCESS);
+}
+
 bool FakeAudioRendererSink::Render(AudioBus* dest, int audio_delay_milliseconds,
                                    int* frames_written) {
   if (state_ != kPlaying)