CSS: Reduce style invalidation with sibling combinators

third_party/WebKit/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,
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         bool treeBoundaryCrossing;
         bool adjacent;
         bool insertionPointCrossing;
         bool forceSubtree;
     };
 
     static bool extractInvalidationSetFeature(const CSSSelector&, InvalidationSetFeatures&);
 
     enum UseFeaturesType { UseFeatures, ForceSubtree };
 
-    std::pair<const CSSSelector*, UseFeaturesType> extractInvalidationSetFeatures(const CSSSelector&, InvalidationSetFeatures&, bool negated);
+    enum PositionType { Subject, Ancestor };
+    std::pair<const CSSSelector*, UseFeaturesType> extractInvalidationSetFeatures(const CSSSelector&, InvalidationSetFeatures&, PositionType, CSSSelector::PseudoType = CSSSelector::PseudoUnknown);
 
     void addFeaturesToInvalidationSet(InvalidationSet&, const InvalidationSetFeatures&);
     void addFeaturesToInvalidationSets(const CSSSelector*, InvalidationSetFeatures* siblingFeatures, InvalidationSetFeatures& descendantFeatures);
 
     void addClassToInvalidationSet(const AtomicString& className, Element&);
 
     FeatureMetadata m_metadata;
     InvalidationSetMap m_classInvalidationSets;
     InvalidationSetMap m_attributeInvalidationSets;
     InvalidationSetMap m_idInvalidationSets;
     PseudoTypeInvalidationSetMap m_pseudoInvalidationSets;
 
     friend class RuleFeatureSetTest;
 };
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::RuleFeature);
 
 #endif // RuleFeature_h