Update smoothed bitrate.

webrtc/voice_engine/channel.h

Index: webrtc/voice_engine/channel.h
diff --git a/webrtc/voice_engine/channel.h b/webrtc/voice_engine/channel.h
index 4056c7fb5688b5b7de5357ab70b876c2a1ef0c32..088b54b5e3950a9ab1cf405663c21bb0462887e6 100644
--- a/webrtc/voice_engine/channel.h
+++ b/webrtc/voice_engine/channel.h
@@ -333,6 +333,7 @@ class Channel
   int SetCodecFECStatus(bool enable);
   bool GetCodecFECStatus();
   void SetNACKStatus(bool enable, int maxNumberOfPackets);
+  void AdaptCodec();
 
   // From AudioPacketizationCallback in the ACM
   int32_t SendData(FrameType frameType,
@@ -548,7 +549,8 @@ class Channel
   // TODO(ossu): Remove once GetAudioDecoderFactory() is no longer needed.
   rtc::scoped_refptr<AudioDecoderFactory> decoder_factory_;
 
-  SmoothingFilterImpl bitrate_smoother_;
+  rtc::CriticalSection bitrate_smoother_lock_;
+  SmoothingFilterImpl bitrate_smoother_ GUARDED_BY(bitrate_smoother_lock_);
 };
 
 }  // namespace voe