Post a microtask to load <img> elements.

Source/core/loader/ImageLoader.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2009 Apple Inc. All rights reserved.
  *
  * 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 47 matching lines @@
     virtual ~ImageLoader();
 
     // This function should be called when the element is attached to a document; starts
     // loading if a load hasn't already been started.
     void updateFromElement();
 
     // This function should be called whenever the 'src' attribute is set, even if its value
     // doesn't change; starts new load unconditionally (matches Firefox and Opera behavior).
     void updateFromElementIgnoringPreviousError();
 
+    // Use this function to determine whether to immediately call updateFromElement
+    // or to schedule a microtask.
+    bool shouldLoadImmediately() const;
+
     void elementDidMoveToNewDocument();
 
     Element* element() const { return m_element; }
     bool imageComplete() const { return m_imageComplete; }
 
     ImageResource* image() const { return m_image.get(); }
     void setImage(ImageResource*); // Cancels pending load events, and doesn't dispatch new ones.
 
     void setLoadManually(bool loadManually) { m_loadManually = loadManually; }
 
@@ skipping 39 matching lines @@
     bool m_hasPendingErrorEvent : 1;
     bool m_imageComplete : 1;
     bool m_loadManually : 1;
     bool m_elementIsProtected : 1;
     unsigned m_highPriorityClientCount;
 };
 
 }
 
 #endif