ViewportChangeListener deregister and reregister on DOM changes.

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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 328 matching lines @@
         else
             renderImageResource->setImageResource(imageLoader().image());
 
     }
 }
 
 Node::InsertionNotificationRequest HTMLImageElement::insertedInto(ContainerNode* insertionPoint)
 {
     if (!m_formWasSetByParser || NodeTraversal::highestAncestorOrSelf(*insertionPoint) != NodeTraversal::highestAncestorOrSelf(*m_form.get()))
         resetFormOwner();
+    if (m_listener)
+        document().mediaQueryMatcher().addViewportListener(m_listener.get());
 
     bool imageWasModified = false;
     if (RuntimeEnabledFeatures::pictureEnabled()) {
         ImageCandidate candidate = findBestFitImageFromPictureParent();
         if (!candidate.isEmpty()) {
             setBestFitURLAndDPRFromImageCandidate(candidate);
             imageWasModified = true;
         }
     }
 
     // If we have been inserted from a renderer-less document,
     // our loader may have not fetched the image, so do it now.
     if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
         imageLoader().updateFromElement(ImageLoader::UpdateNormal, m_elementCreatedByParser ? ImageLoader::ForceLoadImmediately : ImageLoader::LoadNormally);
 
     return HTMLElement::insertedInto(insertionPoint);
 }
 
 void HTMLImageElement::removedFrom(ContainerNode* insertionPoint)
 {
     if (!m_form || NodeTraversal::highestAncestorOrSelf(*m_form.get()) != NodeTraversal::highestAncestorOrSelf(*this))
         resetFormOwner();
+    if (m_listener)
+        document().mediaQueryMatcher().removeViewportListener(m_listener.get());
     HTMLElement::removedFrom(insertionPoint);
 }
 
 int HTMLImageElement::width(bool ignorePendingStylesheets)
 {
     if (!renderer()) {
         // check the attribute first for an explicit pixel value
         bool ok;
         int width = getAttribute(widthAttr).toInt(&ok);
         if (ok)
@@ skipping 251 matching lines @@
     }
     imageLoader().updateFromElement(behavior);
 }
 
 const KURL& HTMLImageElement::sourceURL() const
 {
     return cachedImage()->response().url();
 }
 
 }