Implement A/B experiment for anti-DDoS.

chrome/browser/net/net_pref_observer.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/net/net_pref_observer.h"
 
 #include "base/task.h"
 #include "chrome/browser/net/predictor_api.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/trials/http_throttling_trial.h"
 #include "chrome/common/pref_names.h"
 #include "content/browser/browser_thread.h"
 #include "content/common/notification_type.h"
 #include "content/common/notification_details.h"
 #include "net/http/http_stream_factory.h"
 #include "net/url_request/url_request_throttler_manager.h"
 
 namespace {
 
 // Function (for NewRunnableFunction) to call the set_enforce_throttling
@@ skipping 51 matching lines @@
 void NetPrefObserver::RegisterPrefs(PrefService* prefs) {
   prefs->RegisterBooleanPref(prefs::kNetworkPredictionEnabled,
                              true,
                              PrefService::SYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kDisableSpdy,
                              false,
                              PrefService::UNSYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kHttpThrottlingEnabled,
                              false,
                              PrefService::UNSYNCABLE_PREF);
+  prefs->RegisterBooleanPref(prefs::kHttpThrottlingMayExperiment,
+                             true,
+                             PrefService::UNSYNCABLE_PREF);
+
+  // This is the earliest point at which we can set up the trial, as
+  // it relies on prefs for parameterization.
+  CreateHttpThrottlingTrial(prefs);
 }