Relanding "Pass time constant to bwe smoothing filter."

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 162 matching lines @@
       kalman_estimator_(),
       trendline_estimator_(),
       detector_(OverUseDetectorOptions()),
       receiver_incoming_bitrate_(),
       last_update_ms_(-1),
       last_seen_packet_ms_(-1),
       uma_recorded_(false),
       trendline_window_size_(kDefaultTrendlineWindowSize),
       trendline_smoothing_coeff_(kDefaultTrendlineSmoothingCoeff),
       trendline_threshold_gain_(kDefaultTrendlineThresholdGain),
-      in_trendline_experiment_(TrendlineFilterExperimentIsEnabled()) {
+      in_trendline_experiment_(TrendlineFilterExperimentIsEnabled()),
+      probing_interval_estimator_(&rate_control_) {
   if (in_trendline_experiment_) {
     ReadTrendlineFilterExperimentParameters(&trendline_window_size_,
                                             &trendline_smoothing_coeff_,
                                             &trendline_threshold_gain_);
   }
   network_thread_.DetachFromThread();
 }
 
 DelayBasedBwe::Result DelayBasedBwe::IncomingPacketFeedbackVector(
     const std::vector<PacketInfo>& packet_feedback_vector) {
@@ skipping 129 matching lines @@
   *ssrcs = {kFixedSsrc};
   *bitrate_bps = rate_control_.LatestEstimate();
   return true;
 }
 
 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