Support notifications with custom content

ui/message_center/views/notification_view.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_VIEWS_NOTIFICATION_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_NOTIFICATION_VIEW_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 12 matching lines @@
 
 class BoundedLabel;
 class MessageCenter;
 class NotificationButton;
 class NotificationProgressBarBase;
 class NotificationView;
 class PaddedButton;
 class ProportionalImageView;
 
 // View that displays all current types of notification (web, basic, image, and
-// list). Future notification types may be handled by other classes, in which
-// case instances of those classes would be returned by the Create() factory
-// method below.
+// list) except the custom notification. Future notification types may be
+// handled by other classes, in which case instances of those classes would be
+// returned by the Create() factory method below.
 class MESSAGE_CENTER_EXPORT NotificationView
     : public MessageView,
       public views::ViewTargeterDelegate {
  public:
-  // Creates appropriate MessageViews for notifications. Those currently are
-  // always NotificationView instances but in the future
-  // may be instances of other classes, with the class depending on the
+  // Creates appropriate MessageViews for notifications depending on the
   // notification type. A notification is top level if it needs to be rendered
   // outside the browser window. No custom shadows are created for top level
   // notifications on Linux with Aura.
   // |controller| may be NULL, but has to be set before the view is shown.
   static MessageView* Create(MessageCenterController* controller,
                              const Notification& notification,
                              bool top_level);
   ~NotificationView() override;
 
   // Overridden from views::View:
@@ skipping 68 matching lines @@
   NotificationProgressBarBase* progress_bar_view_ = nullptr;
   std::vector<NotificationButton*> action_buttons_;
   std::vector<views::View*> separators_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationView);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_NOTIFICATION_VIEW_H_