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

media/base/audio_renderer_mixer_input.cc

Index: media/base/audio_renderer_mixer_input.cc
diff --git a/media/base/audio_renderer_mixer_input.cc b/media/base/audio_renderer_mixer_input.cc
index ab9f0a7ecab20e0d2c6ddae12fc6bcc690009960..6194f21ca94d8c1e2a0fc22873cfdef2c82a7af7 100644
--- a/media/base/audio_renderer_mixer_input.cc
+++ b/media/base/audio_renderer_mixer_input.cc
@@ -5,6 +5,7 @@
 #include "media/base/audio_renderer_mixer_input.h"
 
 #include "base/bind.h"
+#include "base/location.h"
 #include "base/logging.h"
 #include "media/base/audio_renderer_mixer.h"
 
@@ -94,6 +95,19 @@ bool AudioRendererMixerInput::SetVolume(double volume) {
   return true;
 }
 
+void AudioRendererMixerInput::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const SwitchOutputDeviceCB& callback) {
+  DVLOG(1) << __FUNCTION__
+           << "(" << device_id << ", " << security_origin << ")";
+  if (mixer_) {
+    mixer_->SwitchOutputDevice(device_id, security_origin, callback);
+  } else {
+    callback.Run(SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED);
+  }
+}
+
 double AudioRendererMixerInput::ProvideInput(AudioBus* audio_bus,
                                              base::TimeDelta buffer_delay) {
   int frames_filled = callback_->Render(