Add Notification images (Blink + desktop implementation)

third_party/WebKit/Source/modules/notifications/Notification.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 236 matching lines @@
 String Notification::body() const
 {
     return m_data.body;
 }
 
 String Notification::tag() const
 {
     return m_data.tag;
 }
 
+String Notification::image() const
+{
+    return m_data.image.string();
+}
+
 String Notification::icon() const
 {
     return m_data.icon.string();
 }
 
 String Notification::badge() const
 {
     return m_data.badge.string();
 }
 
@@ skipping 132 matching lines @@
 
 DEFINE_TRACE(Notification)
 {
     visitor->trace(m_prepareShowMethodRunner);
     visitor->trace(m_loader);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink