Adding stats that can be used to compute output audio levels.

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 4a0b3cc4b1e7dadc076220e3cdb4b437d85aeeef..a2ab0523402bb9c67e434f72b27abf2c1481259a 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -154,6 +154,16 @@ int ChannelProxy::GetSpeechOutputLevelFullRange() const {
   return channel()->GetSpeechOutputLevelFullRange();
 }
 
+double ChannelProxy::GetTotalOutputEnergy() const {
+  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+  return channel()->GetTotalOutputEnergy();
+}
+
+double ChannelProxy::GetTotalOutputDuration() const {
+  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+  return channel()->GetTotalOutputDuration();
+}
+
 uint32_t ChannelProxy::GetDelayEstimate() const {
   RTC_DCHECK(worker_thread_checker_.CalledOnValidThread() ||
              module_process_thread_checker_.CalledOnValidThread());