QUIC - added disable_delay_tcp_race field trial param to disable delaying of racing TCP connection

components/network_session_configurator/network_session_configurator.cc

 // Copyright 2016 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/network_session_configurator/network_session_configurator.h"
 
 #include <map>
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 315 matching lines @@
     const VariationParameters& quic_trial_params) {
   int value;
   if (base::StringToInt(
           GetVariationParam(quic_trial_params, "receive_buffer_size"),
           &value)) {
     return value;
   }
   return 0;
 }
 
+bool ShouldQuicDelayTcpRace(const VariationParameters& quic_trial_params) {
+  return !base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "disable_delay_tcp_race"), "true");
+}
+
 bool ShouldQuicCloseSessionsOnIpChange(
     const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "close_sessions_on_ip_change"),
       "true");
 }
 
 int GetQuicIdleConnectionTimeoutSeconds(
     const VariationParameters& quic_trial_params) {
   int value;
@@ skipping 106 matching lines @@
 
   if (params->enable_quic) {
     params->quic_always_require_handshake_confirmation =
         ShouldQuicAlwaysRequireHandshakeConfirmation(quic_trial_params);
     params->quic_disable_connection_pooling =
         ShouldQuicDisableConnectionPooling(quic_trial_params);
     int receive_buffer_size = GetQuicSocketReceiveBufferSize(quic_trial_params);
     if (receive_buffer_size != 0) {
       params->quic_socket_receive_buffer_size = receive_buffer_size;
     }
+    params->quic_delay_tcp_race = ShouldQuicDelayTcpRace(quic_trial_params);
     float load_server_info_timeout_srtt_multiplier =
         GetQuicLoadServerInfoTimeoutSrttMultiplier(quic_trial_params);
     if (load_server_info_timeout_srtt_multiplier != 0) {
       params->quic_load_server_info_timeout_srtt_multiplier =
           load_server_info_timeout_srtt_multiplier;
     }
     params->quic_enable_connection_racing =
         ShouldQuicEnableConnectionRacing(quic_trial_params);
     params->quic_enable_non_blocking_io =
         ShouldQuicEnableNonBlockingIO(quic_trial_params);
@@ skipping 137 matching lines @@
                                     const std::string& quic_user_agent_id,
                                     net::HttpNetworkSession::Params* params) {
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   ParseFieldTrialsAndCommandLineInternal(
       command_line, is_spdy_allowed_by_policy, is_quic_allowed_by_policy,
       quic_user_agent_id, params);
 }
 
 }  // namespace network_session_configurator