Add a Create method to DesktopNotificationHandler and stubs for the notification objects.

chrome/browser/notifications/desktop_notification_service.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/notifications/desktop_notification_service.h"
 
 #include "base/metrics/histogram.h"
 #include "base/threading/thread.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/content_settings/content_settings_provider.h"
@@ skipping 573 matching lines @@
   }
   return UTF8ToUTF16(origin.host());
 }
 
 void DesktopNotificationService::NotifySettingsChange() {
   NotificationService::current()->Notify(
       NotificationType::DESKTOP_NOTIFICATION_SETTINGS_CHANGED,
       Source<DesktopNotificationService>(this),
       NotificationService::NoDetails());
 }
+
+int DesktopNotificationService::HasPermission(const GURL& origin) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  return prefs_cache()->HasPermission(origin.GetOrigin());
+}