Support notifications with custom content

ui/message_center/notification_delegate.h

 // Copyright 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_NOTIFICATION_DELEGATE_H_
 #define UI_MESSAGE_CENTER_NOTIFICATION_DELEGATE_H_
 
+#include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "ui/message_center/message_center_export.h"
 
 namespace content {
 class RenderViewHost;
 }
 
+namespace views {
+class View;
+}
+
 namespace message_center {
 
 // Delegate for a notification. This class has two roles: to implement callback
 // methods for notification, and to provide an identity of the associated
 // notification.
 class MESSAGE_CENTER_EXPORT NotificationDelegate
     : public base::RefCountedThreadSafe<NotificationDelegate> {
  public:
   // To be called when the desktop notification is actually shown.
   virtual void Display();
@@ skipping 10 matching lines @@
 
   // To be called when the user clicks a button in a notification.
   virtual void ButtonClick(int button_index);
 
   // To be called when the user clicks the settings button in a notification.
   virtual void SettingsClick();
 
   // To be called in order to detect if a settings button should be displayed.
   virtual bool ShouldDisplaySettingsButton();
 
+  // To be called to construct the contents view of a popup for notifications
+  // whose type is NOTIFICATION_TYPE_CUSTOM.
+  virtual std::unique_ptr<views::View> CreateCustomContent();
+
  protected:
   virtual ~NotificationDelegate() {}
 
  private:
   friend class base::RefCountedThreadSafe<NotificationDelegate>;
 };
 
 // A simple notification delegate which invokes the passed closure when clicked.
 class MESSAGE_CENTER_EXPORT HandleNotificationClickedDelegate
     : public NotificationDelegate {
@@ skipping 32 matching lines @@
 
  private:
   ButtonClickCallback button_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(HandleNotificationButtonClickDelegate);
 };
 
 }  //  namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_NOTIFICATION_DELEGATE_H_