Mojo interfaces needed for switching audio rendering stream creation and closing from IPC to Mojo

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 5126b349b06b6168f16dd8caa396a45033cbc552..dbffad11cee9f1cdf9d01b1d07499871be40a748 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -729,6 +729,9 @@ void RenderThreadImpl::Init(
   audio_message_filter_ = new AudioMessageFilter(GetIOMessageLoopProxy());
   AddFilter(audio_message_filter_.get());
 
+  audio_message_filter_->SetAudioOutputClient(
+    new AudioOutputClient(GetServiceRegistry(), audio_message_filter_.get()));
+
   midi_message_filter_ = new MidiMessageFilter(GetIOMessageLoopProxy());
   AddFilter(midi_message_filter_.get());