Make the BWE threshold adaptive.

webrtc/modules/remote_bitrate_estimator/remote_rate_control.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.
  */
 
@@ skipping 21 matching lines @@
 
   // Returns true if the bitrate estimate hasn't been changed for more than
   // an RTT, or if the incoming_bitrate is more than 5% above the current
   // estimate. Should be used to decide if we should reduce the rate further
   // when over-using.
   virtual bool TimeToReduceFurther(int64_t time_now,
                                    uint32_t incoming_bitrate_bps) const = 0;
   virtual uint32_t LatestEstimate() const = 0;
   virtual uint32_t UpdateBandwidthEstimate(int64_t now_ms) = 0;
   virtual void SetRtt(int64_t rtt) = 0;
-  virtual RateControlRegion Update(const RateControlInput* input,
-                                   int64_t now_ms) = 0;
+  virtual void Update(const RateControlInput* input, int64_t now_ms) = 0;
   virtual void SetEstimate(int bitrate_bps, int64_t time_now_ms) = 0;
 
  protected:
   static const int64_t kMaxFeedbackIntervalMs;
 };
 }  // namespace webrtc
 
 #endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_RATE_CONTROL_H_