Tweaked version of BBR for WebRTC.

webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_window.cc

Index: webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_window.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_window.cc b/webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_window.cc
index 3d357704b582f892a7429125a87593fb2927921f..5c01e89aa1dc33c8251d7b4a1caefa4af2e72eef 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_window.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_window.cc
@@ -27,8 +27,6 @@ namespace {
 const int kStartingCongestionWindowBytes = 6000;
 }  // namespace
 
-const int CongestionWindow::kMinimumCongestionWindowBytes;
-
 CongestionWindow::CongestionWindow() : data_inflight_bytes_(0) {}
 
 CongestionWindow::~CongestionWindow() {}
@@ -37,8 +35,6 @@ int CongestionWindow::GetCongestionWindow(BbrBweSender::Mode mode,
                                           int64_t bandwidth_estimate_bps,
                                           rtc::Optional<int64_t> min_rtt_ms,
                                           float gain) {
-  if (mode == BbrBweSender::PROBE_RTT)
-    return CongestionWindow::kMinimumCongestionWindowBytes;
   return GetTargetCongestionWindow(bandwidth_estimate_bps, min_rtt_ms, gain);
 }
 
@@ -47,6 +43,7 @@ void CongestionWindow::PacketSent(size_t sent_packet_size_bytes) {
 }
 
 void CongestionWindow::AckReceived(size_t received_packet_size_bytes) {
+  RTC_DCHECK_GE(data_inflight_bytes_ >= received_packet_size_bytes, true);
   data_inflight_bytes_ -= received_packet_size_bytes;
 }
 
@@ -57,14 +54,13 @@ int CongestionWindow::GetTargetCongestionWindow(
   // If we have no rtt sample yet, return the starting congestion window size.
   if (!min_rtt_ms)
     return gain * kStartingCongestionWindowBytes;
-  int bdp = *min_rtt_ms * bandwidth_estimate_bps;
+  int bdp = *min_rtt_ms * bandwidth_estimate_bps / 8000;
   int congestion_window = bdp * gain;
   // Congestion window could be zero in rare cases, when either no bandwidth
   // estimate is available, or path's min_rtt value is zero.
   if (!congestion_window)
     congestion_window = gain * kStartingCongestionWindowBytes;
-  return std::max(congestion_window,
-                  CongestionWindow::kMinimumCongestionWindowBytes);
+  return congestion_window;
 }
 }  // namespace bwe
 }  // namespace testing