QUIC - Add back to code to experiment with delay_tcp_race. By default,

components/cronet/url_request_context_config.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 "components/cronet/url_request_context_config.h"
 
 #include <utility>
 
 #include "base/json/json_reader.h"
 #include "base/logging.h"
@@ skipping 16 matching lines @@
 
 // Name of disk cache directory.
 const char kDiskCacheDirectoryName[] = "disk_cache";
 // TODO(xunjieli): Refactor constants in io_thread.cc.
 const char kQuicFieldTrialName[] = "QUIC";
 const char kQuicConnectionOptions[] = "connection_options";
 const char kQuicStoreServerConfigsInProperties[] =
     "store_server_configs_in_properties";
 const char kQuicMaxServerConfigsStoredInProperties[] =
     "max_server_configs_stored_in_properties";
+const char kQuicDelayTcpRace[] = "delay_tcp_race";
 const char kQuicMaxNumberOfLossyConnections[] =
     "max_number_of_lossy_connections";
 const char kQuicPacketLossThreshold[] = "packet_loss_threshold";
 const char kQuicIdleConnectionTimeoutSeconds[] =
     "idle_connection_timeout_seconds";
 const char kQuicHostWhitelist[] = "host_whitelist";
 const char kQuicCloseSessionsOnIpChange[] = "close_sessions_on_ip_change";
 const char kQuicMigrateSessionsOnNetworkChange[] =
     "migrate_sessions_on_network_change";
 const char kQuicPreferAes[] = "prefer_aes";
@@ skipping 54 matching lines @@
           net::kMaxQuicServersToPersist);
     }
 
     int quic_max_server_configs_stored_in_properties = 0;
     if (quic_args->GetInteger(kQuicMaxServerConfigsStoredInProperties,
                               &quic_max_server_configs_stored_in_properties)) {
       context_builder->set_quic_max_server_configs_stored_in_properties(
           static_cast<size_t>(quic_max_server_configs_stored_in_properties));
     }
 
+    bool quic_delay_tcp_race = false;
+    if (quic_args->GetBoolean(kQuicDelayTcpRace, &quic_delay_tcp_race)) {
+      context_builder->set_quic_delay_tcp_race(quic_delay_tcp_race);
+    }
+
     int quic_max_number_of_lossy_connections = 0;
     if (quic_args->GetInteger(kQuicMaxNumberOfLossyConnections,
                               &quic_max_number_of_lossy_connections)) {
       context_builder->set_quic_max_number_of_lossy_connections(
           quic_max_number_of_lossy_connections);
     }
 
     double quic_packet_loss_threshold = 0.0;
     if (quic_args->GetDouble(kQuicPacketLossThreshold,
                              &quic_packet_loss_threshold)) {
@@ skipping 171 matching lines @@
 
   ParseAndSetExperimentalOptions(experimental_options, context_builder, net_log,
                                  file_task_runner);
 
   if (mock_cert_verifier)
     context_builder->SetCertVerifier(std::move(mock_cert_verifier));
   // TODO(mef): Use |config| to set cookies.
 }
 
 }  // namespace cronet