Add loadend event when finishing loading image

third_party/WebKit/Source/core/html/HTMLImageLoader.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 19 matching lines @@
 
 class CORE_EXPORT HTMLImageLoader final : public ImageLoader {
 public:
     static HTMLImageLoader* create(Element* element)
     {
         return new HTMLImageLoader(element);
     }
     ~HTMLImageLoader() override;
 
     void dispatchLoadEvent() override;
+    void dispatchLoadendEvent() override;
+    void dispatchLoadendEventSoon() override;
+
+    static void dispatchPendingLoadendEvents();
 
     void imageNotifyFinished(ImageResource*) override;
     String debugName() const override { return "HTMLImageLoader"; }
 
 private:
     explicit HTMLImageLoader(Element*);
     void noImageResourceToLoad() override;
     void ensureFallbackContent();
 };
 
 } // namespace blink
 
 #endif