Add one-time randomization support for FieldTrial, and the ability to

net/socket/stream_socket.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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/stream_socket.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
 
@@ skipping 115 matching lines @@
   else
     result = 0;  // Never used, and not really connected.
 
   if (omnibox_speculation_)
     result += 3;
   else if (subresource_speculation_)
     result += 6;
   UMA_HISTOGRAM_ENUMERATION("Net.PreconnectUtilization2", result, 9);
 
   static const bool connect_backup_jobs_fieldtrial =
-      base::FieldTrialList::Find("ConnnectBackupJobs") &&
-      !base::FieldTrialList::Find("ConnnectBackupJobs")->group_name().empty();
+      base::FieldTrialList::TrialExists("ConnnectBackupJobs");
   if (connect_backup_jobs_fieldtrial) {
     UMA_HISTOGRAM_ENUMERATION(
         base::FieldTrial::MakeName("Net.PreconnectUtilization2",
                                    "ConnnectBackupJobs"),
         result, 9);
   }
 }
 
 void StreamSocket::LogByteTransfer(const BoundNetLog& net_log,
                                    NetLog::EventType event_type,
                                    int byte_count,
                                    char* bytes) const {
   scoped_refptr<NetLog::EventParameters> params;
   if (net_log.IsLoggingBytes()) {
     params = new NetLogBytesTransferredParameter(byte_count, bytes);
   } else {
     params = new NetLogBytesTransferredParameter(byte_count, NULL);
   }
   net_log.AddEvent(event_type, params);
 }
 
 }  // namespace net