Protocol plumbing for audio toggle.

remoting/host/client_session.cc

Index: remoting/host/client_session.cc
diff --git a/remoting/host/client_session.cc b/remoting/host/client_session.cc
index 8a9b84295a254909421011425b08d6bddefc407f..e396779e01249802d2bd6ff4b5a14007a5513293 100644
--- a/remoting/host/client_session.cc
+++ b/remoting/host/client_session.cc
@@ -87,6 +87,13 @@ void ClientSession::ControlVideo(const protocol::VideoControl& video_control) {
   }
 }
 
+void ClientSession::ControlAudio(const protocol::AudioControl& audio_control) {
+  if (audio_control.has_enable()) {
+    VLOG(1) << "Received AudioControl (enable="
+            << audio_control.enable() << ")";
+  }
+}
+
 void ClientSession::OnConnectionAuthenticated(
     protocol::ConnectionToClient* connection) {
   DCHECK(CalledOnValidThread());