relnote: Make QUIC version negotiation stateless. The QUIC dispatcher

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"
 
 // When true, the use time based loss detection instead of nack.
 bool FLAGS_quic_use_time_loss_detection = false;
 
 // If true, it will return as soon as an error is detected while validating
@@ skipping 161 matching lines @@
 // If true, always log the cached network parameters, regardless of whether
 // bandwidth-resumption has been enabled.
 bool FLAGS_quic_log_received_parameters = true;
 
 // If true, QUIC will use newly refactored TCP sender code.
 bool FLAGS_quic_use_new_tcp_sender = true;
 
 // Saves the initial subkey secret in QUIC crypto when deriving keys from the
 // initial premaster secret.
 bool FLAGS_quic_save_initial_subkey_secret = true;
+
+// If true, the QUIC dispatcher will directly send version negotiation
+// packets without needing to create a QUIC session first.
+bool FLAGS_quic_stateless_version_negotiation = true;