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

net/url_request/url_request_context_builder.cc

 // Copyright (c) 2012 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/url_request/url_request_context_builder.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 168 matching lines @@
     : ignore_certificate_errors(false),
       host_mapping_rules(NULL),
       testing_fixed_http_port(0),
       testing_fixed_https_port(0),
       enable_spdy31(false),
       enable_http2(true),
       parse_alternative_services(true),
       enable_alternative_service_with_different_host(false),
       enable_quic(false),
       quic_max_server_configs_stored_in_properties(0),
+      quic_delay_tcp_race(true),
       quic_max_number_of_lossy_connections(0),
       quic_prefer_aes(false),
       quic_packet_loss_threshold(1.0f),
       quic_idle_connection_timeout_seconds(kIdleConnectionTimeoutSeconds),
       quic_close_sessions_on_ip_change(false),
       quic_migrate_sessions_on_network_change(false),
       quic_migrate_sessions_early(false),
       quic_disable_bidirectional_streams(false) {}
 
 URLRequestContextBuilder::HttpNetworkSessionParams::~HttpNetworkSessionParams()
@@ skipping 213 matching lines @@
   network_session_params.enable_http2 =
       http_network_session_params_.enable_http2;
   network_session_params.parse_alternative_services =
       http_network_session_params_.parse_alternative_services;
   network_session_params.enable_alternative_service_with_different_host =
       http_network_session_params_
           .enable_alternative_service_with_different_host;
   network_session_params.enable_quic = http_network_session_params_.enable_quic;
   network_session_params.quic_max_server_configs_stored_in_properties =
       http_network_session_params_.quic_max_server_configs_stored_in_properties;
+  network_session_params.quic_delay_tcp_race =
+      http_network_session_params_.quic_delay_tcp_race;
   network_session_params.quic_max_number_of_lossy_connections =
       http_network_session_params_.quic_max_number_of_lossy_connections;
   network_session_params.quic_packet_loss_threshold =
       http_network_session_params_.quic_packet_loss_threshold;
   network_session_params.quic_idle_connection_timeout_seconds =
       http_network_session_params_.quic_idle_connection_timeout_seconds;
   network_session_params.quic_connection_options =
       http_network_session_params_.quic_connection_options;
   network_session_params.quic_host_whitelist =
       http_network_session_params_.quic_host_whitelist;
@@ skipping 83 matching lines @@
     }
     url_request_interceptors_.clear();
   }
   storage->set_job_factory(std::move(top_job_factory));
   // TODO(willchan): Support sdch.
 
   return std::move(context);
 }
 
 }  // namespace net