Reland: Show message center on lock screen

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>
@@ skipping 31 matching lines @@
   void AddObserver(MessageCenterObserver* observer) override;
   void RemoveObserver(MessageCenterObserver* observer) override;
   void AddNotificationBlocker(NotificationBlocker* blocker) override;
   void RemoveNotificationBlocker(NotificationBlocker* blocker) override;
   void SetVisibility(Visibility visible) override;
   bool IsMessageCenterVisible() const override;
   size_t NotificationCount() const override;
   size_t UnreadNotificationCount() const override;
   bool HasPopupNotifications() const override;
   bool IsQuietMode() const override;
+  bool IsLockedState() const override;
   bool HasClickedListener(const std::string& id) override;
   message_center::Notification* FindVisibleNotificationById(
       const std::string& id) override;
   const NotificationList::Notifications& GetVisibleNotifications() override;
   NotificationList::PopupNotifications GetPopupNotifications() override;
   void AddNotification(std::unique_ptr<Notification> notification) override;
   void UpdateNotification(
       const std::string& old_id,
       std::unique_ptr<Notification> new_notification) override;
   void RemoveNotification(const std::string& id, bool by_user) override;
@@ skipping 10 matching lines @@
   void ClickOnNotificationButton(const std::string& id,
                                  int button_index) override;
   void ClickOnSettingsButton(const std::string& id) override;
   void MarkSinglePopupAsShown(const std::string& id,
                               bool mark_notification_as_read) override;
   void DisplayedNotification(const std::string& id,
                              const DisplaySource source) override;
   void SetNotifierSettingsProvider(NotifierSettingsProvider* provider) override;
   NotifierSettingsProvider* GetNotifierSettingsProvider() override;
   void SetQuietMode(bool in_quiet_mode) override;
+  void SetLockedState(bool locked) override;
   void EnterQuietModeWithExpire(const base::TimeDelta& expires_in) override;
   void RestartPopupTimers() override;
   void PausePopupTimers() override;
   void ForceNotificationFlush(const std::string& id) override;
 
   // NotificationBlocker::Observer overrides:
   void OnBlockingStateChanged(NotificationBlocker* blocker) override;
 
   // message_center::NotifierSettingsObserver overrides:
   void UpdateIconImage(const NotifierId& notifier_id,
@@ skipping 27 matching lines @@
   void RemoveNotificationsForNotifierId(const NotifierId& notifier_id);
 
   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_