Adding cbr support for Opus

webrtc/voice_engine/channel_proxy.cc

Index: webrtc/voice_engine/channel_proxy.cc
diff --git a/webrtc/voice_engine/channel_proxy.cc b/webrtc/voice_engine/channel_proxy.cc
index 7f6e96c97c331dd787649ad2749089fa8edf55e1..55bd4520e57cadda525cab00b2f691edcbf5a126 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -324,6 +324,11 @@ bool ChannelProxy::SetOpusDtx(bool enable) {
   return channel()->SetOpusDtx(enable) == 0;
 }
 
+bool ChannelProxy::SetOpusCbr(bool enable) {
+  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+  return channel()->SetOpusCbr(enable) == 0;
+}
+
 bool ChannelProxy::SetOpusMaxPlaybackRate(int frequency_hz) {
   RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
   return channel()->SetOpusMaxPlaybackRate(frequency_hz) == 0;