Add revocation checking field trial.

net/socket/ssl_client_socket_pool.cc

 // Copyright (c) 2011 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"
@@ skipping 311 matching lines @@
       ssl_socket_->IgnoreCertError(result, params_->load_flags())) {
     DCHECK(ssl_connect_start_time_ != base::TimeTicks());
     base::TimeDelta connect_duration =
         base::TimeTicks::Now() - ssl_connect_start_time_;
     if (using_spdy) {
       UMA_HISTOGRAM_CUSTOM_TIMES("Net.SpdyConnectionLatency",
                                  connect_duration,
                                  base::TimeDelta::FromMilliseconds(1),
                                  base::TimeDelta::FromMinutes(10),
                                  100);
-    } else {
-      UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency",
+    }
+
+    UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency",
+                               connect_duration,
+                               base::TimeDelta::FromMilliseconds(1),
+                               base::TimeDelta::FromMinutes(10),
+                               100);
+
+    const std::string& host = params_->host_and_port().host();
+    bool is_google = host == "google.com" ||
+                     (host.size() > 11 &&
+                      host.rfind(".google.com") == host.size() - 11);
+    if (is_google) {
+      UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency_Google",
                                  connect_duration,
                                  base::TimeDelta::FromMilliseconds(1),
                                  base::TimeDelta::FromMinutes(10),
                                  100);
 
-      const std::string& host = params_->host_and_port().host();
-      bool is_google = host == "google.com" ||
-                       (host.size() > 11 &&
-                        host.rfind(".google.com") == host.size() - 11);
-      if (is_google) {
-        UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency_Google",
+      base::FieldTrial* trial = base::FieldTrialList::Find("RevCheckingImpact");
+      if (trial) {
+        std::string histogram_name;
+        if (trial->group() != base::FieldTrial::kDefaultGroupNumber ||
+            !params_->ssl_config().rev_checking_enabled) {
+          histogram_name =
+              "Net.SSL_Connection_Latency_Google_No_Revocation_Checking";
+        } else {
+          histogram_name =
+              "Net.SSL_Connection_Latency_Google_Revocation_Checking";
+        }
+
+        UMA_HISTOGRAM_CUSTOM_TIMES(histogram_name,
                                    connect_duration,
                                    base::TimeDelta::FromMilliseconds(1),
                                    base::TimeDelta::FromMinutes(10),
                                    100);
       }
     }
   }
 
   if (result == OK || IsCertificateError(result)) {
     set_socket(ssl_socket_.release());
@@ skipping 206 matching lines @@
 
 ClientSocketPoolHistograms* SSLClientSocketPool::histograms() const {
   return base_.histograms();
 }
 
 void SSLClientSocketPool::OnSSLConfigChanged() {
   Flush();
 }
 
 }  // namespace net