Parser support for >>> (shadow-piercing descendant) combinator.

third_party/WebKit/Source/core/css/CSSSelector.h

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 2013 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.
@@ skipping 111 matching lines @@
     AttributeEnd,      // css3: E[foo$="bar"]
     FirstAttributeSelectorMatch = AttributeExact,
   };
 
   enum RelationType {
     SubSelector,       // No combinator
     Descendant,        // "Space" combinator
     Child,             // > combinator
     DirectAdjacent,    // + combinator
     IndirectAdjacent,  // ~ combinator
-    // Special case of shadow DOM pseudo elements / shadow pseudo element
-    ShadowPseudo,
-    ShadowDeep,  // /deep/ combinator
-    ShadowSlot   // slotted to <slot> element
+    // Special cases for shadow DOM related selectors.
+    ShadowPiercingDescendant,  // >>> combinator
+    ShadowDeep,                // /deep/ combinator
+    ShadowPseudo,              // ::shadow pseudo element
+    ShadowSlot                 // ::slotted() pseudo element
   };
 
   enum PseudoType {
     PseudoUnknown,
     PseudoEmpty,
     PseudoFirstChild,
     PseudoFirstOfType,
     PseudoLastChild,
     PseudoLastOfType,
     PseudoOnlyChild,
@@ skipping 194 matching lines @@
   }
 
   bool matchesPseudoElement() const;
 
   bool hasContentPseudo() const;
   bool hasSlottedPseudo() const;
   bool hasDeepCombinatorOrShadowPseudo() const;
   bool needsUpdatedDistribution() const;
 
  private:
-  unsigned m_relation : 3;    // enum RelationType
+  unsigned m_relation : 4;    // enum RelationType
   unsigned m_match : 4;       // enum MatchType
   unsigned m_pseudoType : 8;  // enum PseudoType
   unsigned m_isLastInSelectorList : 1;
   unsigned m_isLastInTagHistory : 1;
   unsigned m_hasRareData : 1;
   unsigned m_isForPage : 1;
   unsigned m_tagIsImplicit : 1;
   unsigned m_relationIsAffectedByPseudoContent : 1;
 
   void setPseudoType(PseudoType pseudoType) {
@@ skipping 172 matching lines @@
 }
 
 inline bool CSSSelector::isIdClassOrAttributeSelector() const {
   return isAttributeSelector() || match() == CSSSelector::Id ||
          match() == CSSSelector::Class;
 }
 
 }  // namespace blink
 
 #endif  // CSSSelector_h