Add field trial for A/B testing of SSL False Start.

net/socket/ssl_client_socket_pool.cc

 // Copyright (c) 2010 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/socket/ssl_client_socket_pool.h"
 
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/values.h"
 #include "net/base/net_errors.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/ssl_cert_request_info.h"
 #include "net/http/http_proxy_client_socket.h"
 #include "net/http/http_proxy_client_socket_pool.h"
 #include "net/socket/client_socket_factory.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/socket/socks_client_socket_pool.h"
@@ skipping 304 matching lines @@
                                  connect_duration,
                                  base::TimeDelta::FromMilliseconds(1),
                                  base::TimeDelta::FromMinutes(10),
                                  100);
     } else {
       UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency",
                                  connect_duration,
                                  base::TimeDelta::FromMilliseconds(1),
                                  base::TimeDelta::FromMinutes(10),
                                  100);
+
+      static bool false_start_trial(
+          base::FieldTrialList::Find("SSLFalseStart") &&
+          !base::FieldTrialList::Find("SSLFalseStart")->group_name().empty());
+      if (false_start_trial) {
+        UMA_HISTOGRAM_CUSTOM_TIMES(base::FieldTrial::MakeName(
+                                       "Net.SSL_Connection_Latency",
+                                       "SSLFalseStart"),
+                                   connect_duration,
+                                   base::TimeDelta::FromMilliseconds(1),
+                                   base::TimeDelta::FromMinutes(10),
+                                   100);
+      }
     }
   }
 
   if (result == OK || IsCertificateError(result)) {
     set_socket(ssl_socket_.release());
   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
     error_response_info_.cert_request_info = new SSLCertRequestInfo;
     ssl_socket_->GetSSLCertRequestInfo(error_response_info_.cert_request_info);
   }
 
@@ skipping 196 matching lines @@
 
 ClientSocketPoolHistograms* SSLClientSocketPool::histograms() const {
   return base_.histograms();
 }
 
 void SSLClientSocketPool::OnSSLConfigChanged() {
   Flush();
 }
 
 }  // namespace net