Add support for switching the audio output device for HTMLMediaElements.

media/mojo/services/mojo_renderer_impl.cc

Index: media/mojo/services/mojo_renderer_impl.cc
diff --git a/media/mojo/services/mojo_renderer_impl.cc b/media/mojo/services/mojo_renderer_impl.cc
index 73e677ddb997a1e55b7ba1c2cf6be651a34541ed..85f26dbb02953c1d07d8017997d5ea0bf6cd1f69 100644
--- a/media/mojo/services/mojo_renderer_impl.cc
+++ b/media/mojo/services/mojo_renderer_impl.cc
@@ -115,6 +115,14 @@ void MojoRendererImpl::SetVolume(float volume) {
   remote_media_renderer_->SetVolume(volume);
 }
 
+void MojoRendererImpl::SwitchAudioOutputDevice(const std::string& device_id,
+                                               const GURL& security_origin) {
+  DVLOG(2) << __FUNCTION__;
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  remote_media_renderer_->SwitchAudioOutputDevice(
+      mojo::String(device_id), mojo::String(security_origin.spec()));
+}
+
 base::TimeDelta MojoRendererImpl::GetMediaTime() {
   base::AutoLock auto_lock(lock_);
   DVLOG(3) << __FUNCTION__ << ": " << time_.InMilliseconds() << " ms";