Race preconnects to HTTP2 proxies that support alternate proxies

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 <unordered_set>
 
 #include "base/metrics/field_trial.h"
@@ skipping 384 matching lines @@
     params->quic_supported_versions = supported_versions;
   }
 }
 
 void ConfigureOptimizePreconnectsToProxiesParams(
     const std::map<std::string, std::string>& proxy_preconnects_trial_params,
     net::HttpNetworkSession::Params* params) {
   params->restrict_to_one_preconnect_for_proxies =
       GetVariationParam(proxy_preconnects_trial_params,
                         "restrict_to_one_preconnect_for_proxies") == "true";
+  params->race_preconnects_to_http2_proxies =
+      GetVariationParam(proxy_preconnects_trial_params,
+                        "race_preconnects_to_http2_proxies") == "true";
 }
 
 }  // anonymous namespace
 
 namespace network_session_configurator {
 
 net::QuicVersion ParseQuicVersion(const std::string& quic_version) {
   net::QuicVersionVector supported_versions = net::AllSupportedVersions();
   for (size_t i = 0; i < supported_versions.size(); ++i) {
     net::QuicVersion version = supported_versions[i];
@@ skipping 31 matching lines @@
   ConfigureTCPFastOpenParams(tfo_trial_group, params);
 
   std::map<std::string, std::string> proxy_preconnects_trial_params;
   variations::GetVariationParams("NetProxyPreconnects",
                                  &proxy_preconnects_trial_params);
   ConfigureOptimizePreconnectsToProxiesParams(proxy_preconnects_trial_params,
                                               params);
 }
 
 }  // namespace network_session_configurator