Add decode() functionality to image elements.

third_party/WebKit/Source/core/loader/ImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 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 470 matching lines @@
 
   // Update ImageAnimationPolicy for m_image.
   if (m_image)
     m_image->updateImageAnimationPolicy();
 
   updateLayoutObject();
 
   if (m_image && m_image->getImage() && m_image->getImage()->isSVGImage())
     toSVGImage(m_image->getImage())->updateUseCounters(element()->document());
 
+  if (isHTMLImageElement(m_element)) {
+    toHTMLImageElement(m_element)->imageNotifyFinished(
+        !resource->errorOccurred());
+  }
+
   if (!m_hasPendingLoadEvent)
     return;
 
   if (resource->errorOccurred()) {
     loadEventSender().cancelEvent(this);
     m_hasPendingLoadEvent = false;
 
     if (resource->resourceError().isAccessCheck()) {
       crossSiteOrCSPViolationOccurred(
           AtomicString(resource->resourceError().failingURL()));
@@ skipping 133 matching lines @@
 }
 
 void ImageLoader::elementDidMoveToNewDocument() {
   if (m_loadDelayCounter)
     m_loadDelayCounter->documentChanged(m_element->document());
   clearFailedLoadURL();
   setImage(0);
 }
 
 }  // namespace blink