[m53 merge] Use LeastUnacked to calculate the packet number length instead of GetLeastPacketAwaited…

net/quic/quic_flags.cc

 // 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.
 
 #include "net/quic/quic_flags.h"
 
 // If true, it will return as soon as an error is detected while validating
 // CHLO.
 bool FLAGS_use_early_return_when_verifying_chlo = true;
 
@@ skipping 120 matching lines @@
 bool FLAGS_quic_ignore_zero_length_frames = true;
 
 // If true, replace ServerHelloNotifier with a check to see if a decrypted
 // packet is forward secure.
 bool FLAGS_quic_no_shlo_listener = true;
 
 // If true, queued retransmission packets, because of write blocked
 // socket, are always sent once the socket gets unblocked
 bool FLAGS_quic_always_write_queued_retransmissions = true;
 
+// Use GetLeastUnacked when updating the packet number length, instead of
+// GetLeastPacketAwaitedByPeer.
+bool FLAGS_quic_least_unacked_packet_number_length = true;
+
 // Adds a RATE connection option to do rate based sending.
 bool FLAGS_quic_rate_based_sending = true;
 
 // If true, QUIC will use cheap stateless rejects without creating a full
 // connection.
 bool FLAGS_quic_use_cheap_stateless_rejects = false;
 
 // If true, treat timestamps from SO_TIMESTAMPING as QuicWallTimes rather
 // than QuicTimes.
 bool FLAGS_quic_socket_walltimestamps = false;
@@ skipping 12 matching lines @@
 
 // Do not use a QuicAckListener in order to confirm a larger Path MTU.
 bool FLAGS_quic_no_mtu_discovery_ack_listener = false;
 
 // Deprecate QuicPacketCreator::next_packet_number_length_ because it's no
 // longer necessary.
 bool FLAGS_quic_simple_packet_number_length = false;
 
 // If true, enables QUIC_VERSION_35.
 bool FLAGS_quic_enable_version_35 = false;