Add a new connection option(BBRR) to enable BBR's rate based recovery. Protected by FLAGS_quic_rel…

net/quic/core/congestion_control/bbr_sender.h

 // Copyright 2016 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.
 
 // BBR (Bottleneck Bandwidth and RTT) congestion control algorithm.
 
 #ifndef NET_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_
 #define NET_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_
 
 #include <cstdint>
@@ skipping 316 matching lines @@
   struct DataDelivered {
     QuicTime ack_time;
     QuicByteCount acked_bytes;
   };
 
   // Data structure to record recently received acks. Used for determining
   // recently seen ack rate over a short period in the past.
   std::deque<DataDelivered> recently_acked_;
   QuicByteCount bytes_recently_acked_;
 
+  // When true, recovery is rate based rather than congestion window based.
+  bool rate_based_recovery_;
+
   DISALLOW_COPY_AND_ASSIGN(BbrSender);
 };
 
 QUIC_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                              const BbrSender::Mode& mode);
 QUIC_EXPORT_PRIVATE std::ostream& operator<<(
     std::ostream& os,
     const BbrSender::DebugState& state);
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_