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

net/http/http_network_session.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/http/http_network_session.h"
 
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/compiler_specific.h"
@@ skipping 95 matching lines @@
       quic_always_require_handshake_confirmation(false),
       quic_disable_connection_pooling(false),
       quic_load_server_info_timeout_srtt_multiplier(0.25f),
       quic_enable_connection_racing(false),
       quic_enable_non_blocking_io(false),
       quic_disable_disk_cache(false),
       quic_prefer_aes(false),
       quic_max_number_of_lossy_connections(0),
       quic_packet_loss_threshold(1.0f),
       quic_socket_receive_buffer_size(kQuicSocketReceiveBufferSize),
+      quic_delay_tcp_race(true),
       quic_max_server_configs_stored_in_properties(0u),
       quic_clock(NULL),
       quic_random(NULL),
       quic_max_packet_length(kDefaultMaxPacketSize),
       enable_user_alternate_protocol_ports(false),
       quic_crypto_client_stream_factory(
           QuicCryptoClientStreamFactory::GetDefaultFactory()),
       quic_max_recent_disabled_reasons(kQuicMaxRecentDisabledReasons),
       quic_threshold_public_resets_post_handshake(0),
       quic_threshold_timeouts_streams_open(0),
@@ skipping 45 matching lines @@
           params.quic_enable_connection_racing,
           params.quic_enable_non_blocking_io,
           params.quic_disable_disk_cache,
           params.quic_prefer_aes,
           params.quic_max_number_of_lossy_connections,
           params.quic_packet_loss_threshold,
           params.quic_max_recent_disabled_reasons,
           params.quic_threshold_public_resets_post_handshake,
           params.quic_threshold_timeouts_streams_open,
           params.quic_socket_receive_buffer_size,
+          params.quic_delay_tcp_race,
           params.quic_max_server_configs_stored_in_properties,
           params.quic_close_sessions_on_ip_change,
           params.disable_quic_on_timeout_with_open_streams,
           params.quic_idle_connection_timeout_seconds,
           params.quic_migrate_sessions_on_network_change,
           params.quic_migrate_sessions_early,
           params.quic_connection_options,
           params.enable_token_binding),
       spdy_session_pool_(params.host_resolver,
                          params.ssl_config_service,
@@ skipping 133 matching lines @@
 
   dict->SetDouble("load_server_info_timeout_srtt_multiplier",
                   params_.quic_load_server_info_timeout_srtt_multiplier);
   dict->SetBoolean("enable_connection_racing",
                    params_.quic_enable_connection_racing);
   dict->SetBoolean("disable_disk_cache", params_.quic_disable_disk_cache);
   dict->SetBoolean("prefer_aes", params_.quic_prefer_aes);
   dict->SetInteger("max_number_of_lossy_connections",
                    params_.quic_max_number_of_lossy_connections);
   dict->SetDouble("packet_loss_threshold", params_.quic_packet_loss_threshold);
-  dict->SetBoolean("delay_tcp_race", true);
+  dict->SetBoolean("delay_tcp_race", params_.quic_delay_tcp_race);
   dict->SetInteger("max_server_configs_stored_in_properties",
                    params_.quic_max_server_configs_stored_in_properties);
   dict->SetInteger("idle_connection_timeout_seconds",
                    params_.quic_idle_connection_timeout_seconds);
   dict->SetBoolean("disable_preconnect_if_0rtt",
                    params_.quic_disable_preconnect_if_0rtt);
   dict->SetBoolean("disable_quic_on_timeout_with_open_streams",
                    params_.disable_quic_on_timeout_with_open_streams);
   dict->SetString("disabled_reason",
                   quic_stream_factory_.QuicDisabledReasonString());
@@ skipping 57 matching lines @@
     case WEBSOCKET_SOCKET_POOL:
       return websocket_socket_pool_manager_.get();
     default:
       NOTREACHED();
       break;
   }
   return NULL;
 }
 
 }  // namespace net