Schedule sibling invalidation sets for sibling insert/remove.

third_party/WebKit/Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 664 matching lines @@
     clearChildNeedsDistributionRecalc();
 }
 
 void Node::setIsLink(bool isLink)
 {
     setFlag(isLink && !SVGImage::isInSVGImage(toElement(this)), IsLinkFlag);
 }
 
 void Node::setNeedsStyleInvalidation()
 {
-    DCHECK(isElementNode());
+    DCHECK(isElementNode() || isShadowRoot());
     setFlag(NeedsStyleInvalidationFlag);
     markAncestorsWithChildNeedsStyleInvalidation();
 }
 
 void Node::markAncestorsWithChildNeedsStyleInvalidation()
 {
     ScriptForbiddenScope forbidScriptDuringRawIteration;
     for (Node* node = parentOrShadowHostNode(); node && !node->childNeedsStyleInvalidation(); node = node->parentOrShadowHostNode())
         node->setChildNeedsStyleInvalidation();
     document().scheduleLayoutTreeUpdateIfNeeded();
@@ skipping 1787 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif