Implement Non-Closable Notification

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 <string>
@@ skipping 82 matching lines @@
   // Basic operations of notification: add/remove/update.
 
   // Adds a new notification.
   virtual void AddNotification(scoped_ptr<Notification> notification) = 0;
 
   // Updates an existing notification with id = old_id and set its id to new_id.
   virtual void UpdateNotification(
       const std::string& old_id,
       scoped_ptr<Notification> new_notification) = 0;
 
   // Removes an existing notification.

[dewittj, 2016/02/03 19:31:37]

All the remove methods should have their own comments now, since it's gotten so
complicated.  It's unclear which will be removed and when.   Should we simplify
this API by passing a RemoveParams type object that specifies the type of things
to remove?

[yoshiki, 2016/02/07 17:49:41]

I think RemoveNotification can be kept as an independent method for convenience.
So I combined the RemoveAll*Notifications methods into one.

   virtual void RemoveNotification(const std::string& id, bool by_user) = 0;
   virtual void RemoveAllNotifications(bool by_user) = 0;
   virtual void RemoveAllVisibleNotifications(bool by_user) = 0;
+  virtual void RemoveAllClosableNotifications(bool by_user) = 0;
 
   // Sets the icon image. Icon appears at the top-left of the notification.
   virtual void SetNotificationIcon(const std::string& notification_id,
                                    const gfx::Image& image) = 0;
 
   // Sets the large image for the notifications of type == TYPE_IMAGE. Specified
   // image will appear below of the notification.
   virtual void SetNotificationImage(const std::string& notification_id,
                                     const gfx::Image& image) = 0;
 
@@ skipping 88 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_