Show message center on lock screen

ui/message_center/message_center.h

 // 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.
 
 #ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 58 matching lines @@
 
   // Management of the observer list.
   virtual void AddObserver(MessageCenterObserver* observer) = 0;
   virtual void RemoveObserver(MessageCenterObserver* observer) = 0;
 
   // Queries of current notification list status.
   virtual size_t NotificationCount() const = 0;
   virtual size_t UnreadNotificationCount() const = 0;
   virtual bool HasPopupNotifications() const = 0;
   virtual bool IsQuietMode() const = 0;
+  virtual bool IsLockedState() const = 0;
   virtual bool HasClickedListener(const std::string& id) = 0;
 
   // Find the notification with the corresponding id. Returns NULL if not found.
   // The returned instance is owned by the message center.
   virtual message_center::Notification* FindVisibleNotificationById(
       const std::string& id) = 0;
 
   // Gets all notifications to be shown to the user in the message center.  Note
   // that queued changes due to the message center being open are not reflected
   // in this list.
@@ skipping 75 matching lines @@
   // Setter/getter of notifier settings provider. This will be a weak reference.
   // This should be set at the initialization process. The getter may return
   // NULL for tests.
   virtual void SetNotifierSettingsProvider(
       NotifierSettingsProvider* provider) = 0;
   virtual NotifierSettingsProvider* GetNotifierSettingsProvider() = 0;
 
   // This can be called to change the quiet mode state (without a timeout).
   virtual void SetQuietMode(bool in_quiet_mode) = 0;
 
+  // This can be called to change the lock mode state.
+  virtual void SetLockedState(bool locked) = 0;
+
   // Temporarily enables quiet mode for |expires_in| time.
   virtual void EnterQuietModeWithExpire(const base::TimeDelta& expires_in) = 0;
 
   // Informs the notification list whether the message center is visible.
   // This affects whether or not a message has been "read".
   virtual void SetVisibility(Visibility visible) = 0;
 
   // Allows querying the visibility of the center.
   virtual bool IsMessageCenterVisible() const = 0;
 
@@ skipping 27 matching lines @@
   // Note carefully: this may break the layout of message center. Shouldn't use
   // this method if the update changes its notification size.
   virtual void ForceNotificationFlush(const std::string& id) {}
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenter);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_H_