Implement the Custom Elements :unresolved pseudoclass

Source/core/css/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 847 matching lines @@
     // See comments in RenderObject::setStyle().
     if (element->hasTagName(iframeTag) || element->hasTagName(frameTag) || element->hasTagName(embedTag) || element->hasTagName(objectTag) || element->hasTagName(appletTag) || element->hasTagName(canvasTag))
         return false;
 
     if (elementHasDirectionAuto(element))
         return false;
 
     if (element->isLink() && state.elementLinkState() != style->insideLink())
         return false;
 
+    if (element->isUnresolvedCustomElement() != state.element()->isUnresolvedCustomElement())
+        return false;
+
     // Deny sharing styles between WebVTT and non-WebVTT nodes.
     if (element->isWebVTTElement() != state.element()->isWebVTTElement())
         return false;
 
     if (element->isWebVTTElement() && state.element()->isWebVTTElement() && toWebVTTElement(element)->isPastNode() != toWebVTTElement(state.element())->isPastNode())
         return false;
 
     if (element == element->document()->webkitCurrentFullScreenElement() || state.element() == state.document()->webkitCurrentFullScreenElement())
         return false;
     return true;
@@ skipping 3483 matching lines @@
     info.addMember(m_state, "state");
 
     // FIXME: move this to a place where it would be called only once?
     info.addMember(CSSDefaultStyleSheets::defaultStyle, "defaultStyle");
     info.addMember(CSSDefaultStyleSheets::defaultQuirksStyle, "defaultQuirksStyle");
     info.addMember(CSSDefaultStyleSheets::defaultPrintStyle,"defaultPrintStyle");
     info.addMember(CSSDefaultStyleSheets::defaultViewSourceStyle, "defaultViewSourceStyle");
 }
 
 } // namespace WebCore