Set the start bitrate to the delay-based BWE.

webrtc/modules/congestion_controller/delay_based_bwe.cc

 /*
  *  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 365 matching lines @@
   RTC_DCHECK(ssrcs);
   RTC_DCHECK(bitrate_bps);
   if (!rate_control_.ValidEstimate())
     return false;
 
   *ssrcs = {kFixedSsrc};
   *bitrate_bps = rate_control_.LatestEstimate();
   return true;
 }
 
+void DelayBasedBwe::SetStartBitrate(int start_bitrate_bps) {
+  LOG(LS_WARNING) << "BWE Setting start bitrate to: " << start_bitrate_bps;
+  rate_control_.SetStartBitrate(start_bitrate_bps);
+}
+
 void DelayBasedBwe::SetMinBitrate(int min_bitrate_bps) {
   // Called from both the configuration thread and the network thread. Shouldn't
   // be called from the network thread in the future.
   rate_control_.SetMinBitrate(min_bitrate_bps);
 }
 
 int64_t DelayBasedBwe::GetProbingIntervalMs() const {
   return probing_interval_estimator_.GetIntervalMs();
 }
 }  // namespace webrtc