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 472 matching lines @@
   // Update ImageAnimationPolicy for image_.
   if (image_)
     image_->UpdateImageAnimationPolicy();
 
   UpdateLayoutObject();
 
   if (image_ && image_->GetImage() && image_->GetImage()->IsSVGImage())
     ToSVGImage(image_->GetImage())
         ->UpdateUseCounters(GetElement()->GetDocument());
 
+  if (isHTMLImageElement(GetElement())) {

[pdr., 2017/05/18 03:20:10]

Nit: put this in HTMLImageLoader::ImageNotifyFinished.

[vmpstr, 2017/05/18 18:51:13]

Done.

+    toHTMLImageElement(GetElement())
+        ->ImageNotifyFinished(!resource->ErrorOccurred());
+  }
+
   if (!has_pending_load_event_)
     return;
 
   if (resource->ErrorOccurred()) {
     LoadEventSender().CancelEvent(this);
     has_pending_load_event_ = false;
 
     if (resource->GetResourceError().IsAccessCheck()) {
       CrossSiteOrCSPViolationOccurred(
           AtomicString(resource->GetResourceError().FailingURL()));
@@ skipping 133 matching lines @@
 }
 
 void ImageLoader::ElementDidMoveToNewDocument() {
   if (load_delay_counter_)
     load_delay_counter_->DocumentChanged(element_->GetDocument());
   ClearFailedLoadURL();
   SetImage(0);
 }
 
 }  // namespace blink