Reland of Supervised Users: Create ResourceThrottle only if filtering is enabled

chrome/browser/supervised_user/supervised_user_service.cc

 // Copyright 2014 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/supervised_user/supervised_user_service.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 423 matching lines @@
 SupervisedUserURLFilter*
 SupervisedUserService::URLFilterContext::ui_url_filter() const {
   return ui_url_filter_.get();
 }
 
 SupervisedUserURLFilter*
 SupervisedUserService::URLFilterContext::io_url_filter() const {
   return io_url_filter_.get();
 }
 
+void SupervisedUserService::URLFilterContext::SetEnabled(bool enabled) {
+  ui_url_filter_->SetEnabled(enabled);
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                          base::Bind(&SupervisedUserURLFilter::SetEnabled,
+                                     io_url_filter_, enabled));
+}
+
 void SupervisedUserService::URLFilterContext::SetDefaultFilteringBehavior(
     SupervisedUserURLFilter::FilteringBehavior behavior) {
   ui_url_filter_->SetDefaultFilteringBehavior(behavior);
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&SupervisedUserURLFilter::SetDefaultFilteringBehavior,
                  io_url_filter_, behavior));
 }
 
@@ skipping 211 matching lines @@
 
 #if !defined(OS_ANDROID)
     if (waiting_for_sync_initialization_)
       ProfileSyncServiceFactory::GetForProfile(profile_)->RemoveObserver(this);
 
     // TODO(bauerb): Get rid of the platform-specific #ifdef here.
     // http://crbug.com/313377
     BrowserList::RemoveObserver(this);
 #endif
   }
+
+  url_filter_context_.SetEnabled(active_);
 }
 
 #if !defined(OS_ANDROID)
 void SupervisedUserService::OnCustodianProfileDownloaded(
     const base::string16& full_name) {
   profile_->GetPrefs()->SetString(prefs::kSupervisedUserCustodianName,
                                   base::UTF16ToUTF8(full_name));
 }
 
 void SupervisedUserService::OnSupervisedUserRegistered(
@@ skipping 595 matching lines @@
     content::RecordAction(UserMetricsAction("ManagedUsers_SwitchProfile"));
 
   is_profile_active_ = profile_became_active;
 }
 #endif  // !defined(OS_ANDROID)
 
 void SupervisedUserService::OnSiteListUpdated() {
   for (SupervisedUserServiceObserver& observer : observer_list_)
     observer.OnURLFilterChanged();
 }