Implement select listbox using shadow DOM

Source/core/css/SelectorChecker.h

 /*
  * 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 51 matching lines @@
             , previousElement(0)
             , scope(0)
             , visitedMatchType(visitedMatchType)
             , pseudoId(NOPSEUDO)
             , elementStyle(0)
             , scrollbar(0)
             , scrollbarPart(NoPart)
             , isSubSelector(false)
             , hasScrollbarPseudo(false)
             , hasSelectionPseudo(false)
+            , isUARule(false)
             , contextFlags(DefaultBehavior)
         { }
 
         const CSSSelector* selector;
         Element* element;
         Element* previousElement;
         const ContainerNode* scope;
         VisitedMatchType visitedMatchType;
         PseudoId pseudoId;
         RenderStyle* elementStyle;
         RenderScrollbar* scrollbar;
         ScrollbarPart scrollbarPart;
         bool isSubSelector;
         bool hasScrollbarPseudo;
         bool hasSelectionPseudo;
+        bool isUARule;
         ContextFlags contextFlags;
     };
 
     struct MatchResult {
         MatchResult()
             : dynamicPseudo(NOPSEUDO)
             , specificity(0) { }
 
         PseudoId dynamicPseudo;
         unsigned specificity;
     };
 
     template<typename SiblingTraversalStrategy>
     Match match(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult* = 0) const;
 
     template<typename SiblingTraversalStrategy>
     bool checkOne(const SelectorCheckingContext&, const SiblingTraversalStrategy&, unsigned* specificity = 0) const;
 
     bool strictParsing() const { return m_strictParsing; }
 
     Mode mode() const { return m_mode; }
 
     static bool tagMatches(const Element&, const QualifiedName&);
     static bool isCommonPseudoClassSelector(const CSSSelector&);
     static bool matchesFocusPseudoClass(const Element&);
+    static bool matchesSpatialNavigationFocusPseudoClass(const Element&);
     static bool checkExactAttribute(const Element&, const QualifiedName& selectorAttributeName, const StringImpl* value);
 
     enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
     static unsigned determineLinkMatchType(const CSSSelector&);
 
     static bool isHostInItsShadowTree(const Element&, const ContainerNode* scope);
 
 private:
     template<typename SiblingTraversalStrategy>
     Match matchForSubSelector(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const;
@@ skipping 49 matching lines @@
 }
 
 inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, const ContainerNode* scope)
 {
     return scope && scope->isInShadowTree() && scope->shadowHost() == element;
 }
 
 }
 
 #endif