[Mac] Implement a NotificationUIManager that uses Notification Center on 10.8 for text notifications

chrome/browser/notifications/notification_ui_manager.cc

+// Copyright (c) 2012 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 "chrome/browser/notifications/balloon_collection.h"
+#include "chrome/browser/notifications/notification_ui_manager_impl.h"
+
+// static
+NotificationUIManager* NotificationUIManager::Create(PrefService* local_state) {
+  return Create(local_state, BalloonCollection::Create());
+}
+
+#if !defined(OS_MACOSX)
+// static
+NotificationUIManager* NotificationUIManager::Create(
+    PrefService* local_state,
+    BalloonCollection* balloons) {
+  NotificationUIManagerImpl* instance =
+      new NotificationUIManagerImpl(local_state);
+  instance->Initialize(balloons);
+  balloons->set_space_change_listener(instance);
+  return instance;
+}
+#endif  // !OS_MACOSX