Add support for switching the audio output device for HTMLMediaElements.

media/renderers/audio_renderer_impl.cc

Index: media/renderers/audio_renderer_impl.cc
diff --git a/media/renderers/audio_renderer_impl.cc b/media/renderers/audio_renderer_impl.cc
index d17a0689134d6075491a70e18b66fb5d0d63a9a6..335f13658950d3190c1349e75cc6268f4a47e6ae 100644
--- a/media/renderers/audio_renderer_impl.cc
+++ b/media/renderers/audio_renderer_impl.cc
@@ -396,6 +396,17 @@ void AudioRendererImpl::SetVolume(float volume) {
   sink_->SetVolume(volume);
 }
 
+void AudioRendererImpl::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const base::Callback<void(int)>& callback) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  DCHECK(sink_.get());
+  DVLOG(1) << __FUNCTION__ << "(" << device_id << ", " << security_origin << ")"
+           << ". Forwarding to sink " << sink_ << ".";
+  sink_->SwitchOutputDevice(device_id, security_origin, callback);
+}
+
 void AudioRendererImpl::DecodedAudioReady(
     AudioBufferStream::Status status,
     const scoped_refptr<AudioBuffer>& buffer) {