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

chrome/browser/notifications/notification_ui_manager.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/notification_ui_manager.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util-inl.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 49 matching lines @@
 
 NotificationUIManager::~NotificationUIManager() {
   STLDeleteElements(&show_queue_);
 #if defined(OS_MACOSX)
   StopFullScreenMonitor();
 #endif
 }
 
 // static
 NotificationUIManager* NotificationUIManager::Create(PrefService* local_state) {
-  BalloonCollection* balloons = BalloonCollection::Create();
+  return Create(local_state, BalloonCollection::Create());
+}
+
+// static
+NotificationUIManager* NotificationUIManager::Create(
+    PrefService* local_state,
+    BalloonCollection* balloons) {
   NotificationUIManager* instance = new NotificationUIManager(local_state);
   instance->Initialize(balloons);
   balloons->set_space_change_listener(instance);
   return instance;
 }
 
 // static
 void NotificationUIManager::RegisterPrefs(PrefService* prefs) {
   prefs->RegisterIntegerPref(prefs::kDesktopNotificationPosition,
                              BalloonCollection::DEFAULT_POSITION);
@@ skipping 153 matching lines @@
   } else if (type == NotificationType::PREF_CHANGED) {
     std::string* name = Details<std::string>(details).ptr();
     if (*name == prefs::kDesktopNotificationPosition)
       balloon_collection_->SetPositionPreference(
           static_cast<BalloonCollection::PositionPreference>(
               position_pref_.GetValue()));
   } else {
     NOTREACHED();
   }
 }