Add thread-checker for public methods of message center

ui/message_center/message_center_impl.h

 // Copyright (c) 2013 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.
 
 #ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_IMPL_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_observer.h"
 #include "ui/message_center/message_center_types.h"
 #include "ui/message_center/notification_blocker.h"
 #include "ui/message_center/notifier_settings.h"
 #include "ui/message_center/popup_timers_controller.h"
 
 namespace message_center {
@@ skipping 86 matching lines @@
     ~NotificationCache();
     void Rebuild(const NotificationList::Notifications& notifications);
     void RecountUnread();
 
     NotificationList::Notifications visible_notifications;
     size_t unread_count;
   };
 
   void RemoveNotificationsForNotifierId(const NotifierId& notifier_id);
 
+  THREAD_CHECKER(thread_checker_);
+
   std::unique_ptr<NotificationList> notification_list_;
   NotificationCache notification_cache_;
   base::ObserverList<MessageCenterObserver> observer_list_;
   std::unique_ptr<PopupTimersController> popup_timers_controller_;
   std::unique_ptr<base::OneShotTimer> quiet_mode_timer_;
   NotifierSettingsProvider* settings_provider_;
   std::vector<NotificationBlocker*> blockers_;
 
   bool locked_ = false;
   bool visible_ = false;
 
   // Queue for the notifications to delay the addition/updates when the message
   // center is visible.
   std::unique_ptr<internal::ChangeQueue> notification_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterImpl);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_H_