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

net/quic/congestion_control/tcp_cubic_sender_packets.cc

 // Copyright (c) 2012 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/tcp_cubic_sender_packets.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram_macros.h"
 #include "net/quic/congestion_control/prr_sender.h"
@@ skipping 100 matching lines @@
     DVLOG(1) << "Ignoring loss for largest_missing:" << packet_number
              << " because it was sent prior to the last CWND cutback.";
     return;
   }
   ++stats_->tcp_loss_events;
   last_cutback_exited_slowstart_ = InSlowStart();
   if (InSlowStart()) {
     ++stats_->slowstart_packets_lost;
   }
 
-  prr_.OnPacketLost(bytes_in_flight);
+  if (!no_prr_) {
+    prr_.OnPacketLost(bytes_in_flight);
+  }
 
   // TODO(jri): Separate out all of slow start into a separate class.
   if (slow_start_large_reduction_ && InSlowStart()) {
     DCHECK_LT(1u, congestion_window_);
     if (FLAGS_quic_sslr_limit_reduction &&
         congestion_window_ >= 2 * initial_tcp_congestion_window_) {
       min_slow_start_exit_window_ = congestion_window_ / 2;
     }
     congestion_window_ = congestion_window_ - 1;
   } else if (reno_) {
@@ skipping 82 matching lines @@
   congestion_window_ = initial_tcp_congestion_window_;
   slowstart_threshold_ = initial_max_tcp_congestion_window_;
   max_tcp_congestion_window_ = initial_max_tcp_congestion_window_;
 }
 
 CongestionControlType TcpCubicSenderPackets::GetCongestionControlType() const {
   return reno_ ? kReno : kCubic;
 }
 
 }  // namespace net