Implement ::shadow pseudo element and replace /shadow/ with ::shadow.

Source/core/css/CSSParserValues.h

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 216 matching lines @@
     void setRelationIsAffectedByPseudoContent() { m_selector->setRelationIsAffectedByPseudoContent(); }
     bool relationIsAffectedByPseudoContent() const { return m_selector->relationIsAffectedByPseudoContent(); }
 
     void adoptSelectorVector(Vector<OwnPtr<CSSParserSelector> >& selectorVector);
 
     bool hasHostPseudoSelector() const;
     bool isContentPseudoElement() const { return m_selector->isContentPseudoElement(); }
 
     CSSSelector::PseudoType pseudoType() const { return m_selector->pseudoType(); }
     bool isCustomPseudoElement() const { return m_selector->isCustomPseudoElement(); }
-    bool needsCrossingTreeScopeBoundary() const { return isCustomPseudoElement() || pseudoType() == CSSSelector::PseudoCue; }
+    bool crossesTreeScopes() const { return isCustomPseudoElement() || pseudoType() == CSSSelector::PseudoCue || pseudoType() == CSSSelector::PseudoShadow; }
 
     bool isSimple() const;
     bool hasShadowPseudo() const;
 
     CSSParserSelector* tagHistory() const { return m_tagHistory.get(); }
     void setTagHistory(PassOwnPtr<CSSParserSelector> selector) { m_tagHistory = selector; }
     void clearTagHistory() { m_tagHistory.clear(); }
     void insertTagHistory(CSSSelector::Relation before, PassOwnPtr<CSSParserSelector>, CSSSelector::Relation after);
     void appendTagHistory(CSSSelector::Relation, PassOwnPtr<CSSParserSelector>);
     void prependTagSelector(const QualifiedName&, bool tagIsForNamespaceRule = false);
@@ skipping 29 matching lines @@
 inline void CSSParserValue::setFromValueList(PassOwnPtr<CSSParserValueList> valueList)
 {
     id = CSSValueInvalid;
     this->valueList = valueList.leakPtr();
     unit = ValueList;
 }
 
 }
 
 #endif