Make the BWE threshold adaptive.

webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc

Index: webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc b/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
index 6bbb34328e1ca313381f60a0e66f86905aaa3aa2..f91f1ccdf59a1f6aaccd69ebce58d731d6521805 100644
--- a/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
+++ b/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
@@ -150,9 +150,9 @@ void RemoteBitrateEstimatorImpl::IncomingPacket(int64_t arrival_time_ms,
                                estimator->estimator.num_of_deltas(), now_ms);
   }
   if (estimator->detector.State() == kBwOverusing) {
-    uint32_t incoming_bitrate = incoming_bitrate_.Rate(now_ms);
+    uint32_t incoming_bitrate_bps = incoming_bitrate_.Rate(now_ms);
     if (prior_state != kBwOverusing ||
-        remote_rate_->TimeToReduceFurther(now_ms, incoming_bitrate)) {
+        remote_rate_->TimeToReduceFurther(now_ms, incoming_bitrate_bps)) {
       // The first overuse should immediately trigger a new estimate.
       // We also have to update the estimate immediately if we are overusing
       // and the target bitrate is too high compared to what we are receiving.
@@ -218,7 +218,7 @@ void RemoteBitrateEstimatorImpl::UpdateEstimate(int64_t now_ms) {
   const RateControlInput input(bw_state,
                                incoming_bitrate_.Rate(now_ms),
                                mean_noise_var);
-  const RateControlRegion region = remote_rate_->Update(&input, now_ms);
+  remote_rate_->Update(&input, now_ms);
   unsigned int target_bitrate = remote_rate_->UpdateBandwidthEstimate(now_ms);
   if (remote_rate_->ValidEstimate()) {
     process_interval_ms_ = remote_rate_->GetFeedbackInterval();
@@ -226,9 +226,6 @@ void RemoteBitrateEstimatorImpl::UpdateEstimate(int64_t now_ms) {
     GetSsrcs(&ssrcs);
     observer_->OnReceiveBitrateChanged(ssrcs, target_bitrate);
   }
-  for (it = overuse_detectors_.begin(); it != overuse_detectors_.end(); ++it) {
-    it->second->detector.SetRateControlRegion(region);
-  }
 }
 
 void RemoteBitrateEstimatorImpl::OnRttUpdate(int64_t rtt) {