Fix issue where the first audio packets significantly impacts initial BWE negatively.

webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h

 /*
  *  Copyright (c) 2012 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.
  */
 
 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_BWE_DEFINES_H_
 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_BWE_DEFINES_H_
 
 #include "webrtc/typedefs.h"
 
 #define BWE_MAX(a,b) ((a)>(b)?(a):(b))
 #define BWE_MIN(a,b) ((a)<(b)?(a):(b))
 
 namespace webrtc {
+
+static const int64_t kBitrateWindowMs = 1000;
+
 enum BandwidthUsage
 {
     kBwNormal = 0,
     kBwUnderusing = 1,
     kBwOverusing = 2,
 };
 
 enum RateControlState
 {
     kRcHold,
@@ skipping 18 matching lines @@
           _incomingBitRate(incomingBitRate),
           _noiseVar(noiseVar) {}
 
     BandwidthUsage  _bwState;
     uint32_t      _incomingBitRate;
     double              _noiseVar;
 };
 }  // namespace webrtc
 
 #endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_BWE_DEFINES_H_