updateStyleForNodeIfNeeded should be Shadow DOM aware

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 1680 matching lines @@
     AnimationUpdateBlock animationUpdateBlock(m_frame ? m_frame->animation() : 0);
     recalcStyle(NoChange);
 }
 
 void Document::updateStyleForNodeIfNeeded(Node* node)
 {
     if (!hasPendingForcedStyleRecalc() && !childNeedsStyleRecalc() && !needsStyleRecalc())
         return;
 
     bool needsStyleRecalc = hasPendingForcedStyleRecalc();
-    for (Node* n = node; n && !needsStyleRecalc; n = n->parentNode())
-        needsStyleRecalc = n->needsStyleRecalc();
+    for (Node* ancestor = node; ancestor && !needsStyleRecalc; ancestor = ancestor->parentOrShadowHostNode())
+        needsStyleRecalc = ancestor->needsStyleRecalc();
     if (needsStyleRecalc)
         updateStyleIfNeeded();
 }
 
 void Document::updateLayout()
 {
     ASSERT(isMainThread());
 
     FrameView* frameView = view();
     if (frameView && frameView->isInLayout()) {
@@ skipping 3448 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ScriptExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore