Update smoothed bitrate.

webrtc/common_audio/smoothing_filter.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 28 matching lines @@
   void SetTimeConstantMs(int time_constant_ms) override;
 
  private:
   int time_constant_ms_;
   const Clock* const clock_;
 
   bool first_sample_received_;
   bool initialized_;
   int64_t first_sample_time_ms_;
   int64_t last_sample_time_ms_;
+  float last_sample_;
   rtc::ExpFilter filter_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SmoothingFilterImpl);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_AUDIO_SMOOTHING_FILTER_H_