Post a microtask to load <img> elements.

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 10 matching lines @@
 
 #include "config.h"
 #include "core/loader/ImageLoader.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/events/Event.h"
 #include "core/events/EventSender.h"
 #include "core/fetch/CrossOriginAccessControl.h"
 #include "core/fetch/FetchRequest.h"
+#include "core/fetch/MemoryCache.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/html/HTMLObjectElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/rendering/RenderImage.h"
 #include "core/rendering/RenderVideo.h"
 #include "core/rendering/svg/RenderSVGImage.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace WebCore {
 
@@ skipping 175 matching lines @@
     // from this function as doing so might result in the destruction of this ImageLoader.
     updatedHasPendingEvent();
 }
 
 void ImageLoader::updateFromElementIgnoringPreviousError()
 {
     clearFailedLoadURL();
     updateFromElement();
 }
 
+bool ImageLoader::shouldLoadImmediately() const
+{
+    if (m_loadManually)
+        return true;
+
+    AtomicString attr = m_element->imageSourceURL();
+    if (attr.isNull() || stripLeadingAndTrailingHTMLSpaces(attr).isEmpty()) {
+        return true;
+    }
+
+    KURL url = m_element->document().completeURL(sourceURI(attr));
+    if (url.protocolIsData())
+        return true;

[abarth-chromium, 2014/04/01 23:57:14]

Why are data URLs special?

+    if (memoryCache()->resourceForURL(url))
+        return true;
+    return false;
+}
+
 void ImageLoader::notifyFinished(Resource* resource)
 {
     ASSERT(m_failedLoadURL.isEmpty());
     ASSERT(resource == m_image.get());
 
     m_imageComplete = true;
     updateRenderer();
 
     if (!m_hasPendingLoadEvent)
         return;
@@ skipping 164 matching lines @@
         handle->notifyImageSourceChanged();
     }
 }
 
 inline void ImageLoader::clearFailedLoadURL()
 {
     m_failedLoadURL = AtomicString();
 }
 
 }