Support style invalidation for ::content.

Source/core/css/RuleFeature.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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 130 matching lines @@
     DescendantInvalidationSet& ensureIdInvalidationSet(const AtomicString& attributeName);
     DescendantInvalidationSet& ensurePseudoInvalidationSet(CSSSelector::PseudoType);
 
     InvalidationSetMode updateInvalidationSets(const CSSSelector&);
 
     struct InvalidationSetFeatures {
         InvalidationSetFeatures()
             : customPseudoElement(false)
             , treeBoundaryCrossing(false)
             , adjacent(false)
+            , insertionPointCrossing(false)
         { }
         Vector<AtomicString> classes;
         Vector<AtomicString> attributes;
         AtomicString id;
         AtomicString tagName;
         bool customPseudoElement;
         bool treeBoundaryCrossing;
         bool adjacent;
+        bool insertionPointCrossing;
     };
 
     static void extractInvalidationSetFeature(const CSSSelector&, InvalidationSetFeatures&);
     const CSSSelector* extractInvalidationSetFeatures(const CSSSelector&, InvalidationSetFeatures&, bool negated);
 
     void addFeaturesToInvalidationSet(DescendantInvalidationSet&, const InvalidationSetFeatures&);
     void addFeaturesToInvalidationSets(const CSSSelector&, InvalidationSetFeatures&);
 
     void addClassToInvalidationSet(const AtomicString& className, Element&);
 
@@ skipping 12 matching lines @@
 
 template <> struct VectorTraits<blink::RuleFeature> : VectorTraitsBase<blink::RuleFeature> {
     static const bool needsDestruction = false;
     static const bool canInitializeWithMemset = true;
     static const bool canMoveWithMemcpy = true;
 };
 
 } // namespace WTF
 
 #endif // RuleFeature_h