Increases inflight limit for QUIC BBR if the ack rate in the past half-rtt was lower than half the…

net/quic/core/quic_flags_list.h

 // Copyright 2014 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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate values.
 
 // This file contains the list of QUIC protocol flags.
 
 // If true, QUIC BBR congestion control may be enabled via Finch and/or via QUIC
@@ skipping 190 matching lines @@
 // Base CWND on SRTT instead of min_rtt for QUIC BBR.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_base_cwnd_on_srtt, false)
 
 // If true, enable random padding of size [1, 256] when response body is
 // compressed for QUIC version >= 38.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_random_padding, false)
 
 // Use conservation in PROBE_BW ouside of super-unity gain and immediately
 // preceeding cycle.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_extra_conservation, false)
+
+// Increase BBR's inflight limit if recent ack rate is low.
+QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_slow_recent_delivery, false)
+
+// Congestion window gain for QUIC BBR during slow delivery.
+QUIC_FLAG(double, FLAGS_quic_bbr_slow_delivery_cwnd_gain, 4.0f );
+
+// Threshold multiplier below which delivery is considered slow.
+QUIC_FLAG(double, FLAGS_quic_bbr_slow_delivery_threshold_multiplier, 0.5f);