Implement a QUIC No PRR connection option, NPRR. Protected by FLAGS_quic_allow_no_prr

net/quic/congestion_control/pacing_sender.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/congestion_control/pacing_sender.h"
 
 #include "net/quic/quic_flags.h"
 
 using std::min;
 
@@ skipping 35 matching lines @@
 }
 
 void PacingSender::SetMaxPacingRate(QuicBandwidth max_pacing_rate) {
   max_pacing_rate_ = max_pacing_rate;
 }
 
 void PacingSender::OnCongestionEvent(bool rtt_updated,
                                      QuicByteCount bytes_in_flight,
                                      const CongestionVector& acked_packets,
                                      const CongestionVector& lost_packets) {
+  if (FLAGS_quic_allow_noprr && !lost_packets.empty()) {
+    // Clear any burst tokens when entering recovery.
+    burst_tokens_ = 0;
+  }
   sender_->OnCongestionEvent(rtt_updated, bytes_in_flight, acked_packets,
                              lost_packets);
 }
 
 bool PacingSender::OnPacketSent(
     QuicTime sent_time,
     QuicByteCount bytes_in_flight,
     QuicPacketNumber packet_number,
     QuicByteCount bytes,
     HasRetransmittableData has_retransmittable_data) {
@@ skipping 116 matching lines @@
 
 QuicByteCount PacingSender::GetSlowStartThreshold() const {
   return sender_->GetSlowStartThreshold();
 }
 
 CongestionControlType PacingSender::GetCongestionControlType() const {
   return sender_->GetCongestionControlType();
 }
 
 }  // namespace net