Implement A/B experiment for anti-DDoS.

chrome/browser/browser_main.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 "chrome/browser/browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 470 matching lines @@
     net::internal::ClientSocketPoolBaseHelper::set_connect_backup_jobs_enabled(
         true);
   } else if (parsed_command_line().HasSwitch(
         switches::kDisableConnectBackupJobs)) {
     net::internal::ClientSocketPoolBaseHelper::set_connect_backup_jobs_enabled(
         false);
   } else {
     const base::FieldTrial::Probability kConnectBackupJobsDivisor = 100;
     // 1% probability.
     const base::FieldTrial::Probability kConnectBackupJobsProbability = 1;
-    // After June 30, 2011 builds, it will always be in defaut group.
+    // After June 30, 2011 builds, it will always be in default group.
     scoped_refptr<base::FieldTrial> trial(
         new base::FieldTrial("ConnnectBackupJobs",
             kConnectBackupJobsDivisor, "ConnectBackupJobsEnabled", 2011, 6,
                 30));
     const int connect_backup_jobs_enabled = trial->kDefaultGroupNumber;
     trial->AppendGroup("ConnectBackupJobsDisabled",
                        kConnectBackupJobsProbability);
     const int trial_group = trial->group();
     net::internal::ClientSocketPoolBaseHelper::set_connect_backup_jobs_enabled(
         trial_group == connect_backup_jobs_enabled);
@@ skipping 1466 matching lines @@
 #if defined(OS_CHROMEOS)
   // To be precise, logout (browser shutdown) is not yet done, but the
   // remaining work is negligible, hence we say LogoutDone here.
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutDone",
                                                         false);
   chromeos::BootTimesLoader::Get()->WriteLogoutTimes();
 #endif
   TRACE_EVENT_END_ETW("BrowserMain", 0, 0);
   return result_code;
 }