Ensure that BBR does not drop to exceedingly low pacing rates during the STARTUP phase. Protected …

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 252 matching lines @@
   bool last_sample_is_app_limited_;
 
   // Current state of recovery.
   RecoveryState recovery_state_;
   // Receiving acknowledgement of a packet after |end_recovery_at_| will cause
   // BBR to exit the recovery mode.
   QuicPacketNumber end_recovery_at_;
   // A window used to limit the number of bytes in flight during loss recovery.
   QuicByteCount recovery_window_;
 
+  // Indicates whether to always only increase the pacing rate during startup.
+  // Latches |FLAGS_quic_bbr_faster_startup|.
+  bool enforce_startup_pacing_rate_increase_;
+
   DISALLOW_COPY_AND_ASSIGN(BbrSender);
 };
 
 NET_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                             const BbrSender::Mode& mode);
 NET_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                             const BbrSender::DebugState& state);
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_