Add a first pass of a class descendant invalidator, and a containing RuleSetAnalyzer

Source/core/css/resolver/StyleResolver.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 291 matching lines @@
 
     Document& m_document;
     SelectorFilter m_selectorFilter;
 
     RefPtr<ViewportStyleResolver> m_viewportStyleResolver;
 
     ListHashSet<CSSStyleSheet*, 16> m_pendingStyleSheets;
 
     ScopedStyleTree m_styleTree;
 
-    // FIXME: The entire logic of collecting features on StyleResolver, as well astransferring them
+    // FIXME: The entire logic of collecting features on StyleResolver, as well as transferring them
     // between various parts of machinery smells wrong. This needs to be better somehow.
     RuleFeatureSet m_features;
     OwnPtr<RuleSet> m_siblingRuleSet;
     OwnPtr<RuleSet> m_uncommonAttributeRuleSet;
 
     // FIXME: watched selectors should be implemented using injected author stylesheets: http://crbug.com/316960
     OwnPtr<RuleSet> m_watchedSelectorsRules;
     TreeBoundaryCrossingRules m_treeBoundaryCrossingRules;
 
     bool m_needCollectFeatures;
@@ skipping 19 matching lines @@
         SelectorChecker::SelectorCheckingContext selectorCheckingContext(s, regionElement, SelectorChecker::VisitedMatchDisabled);
         if (selectorChecker.match(selectorCheckingContext, DOMSiblingTraversalStrategy()) == SelectorChecker::SelectorMatches)
             return true;
     }
     return false;
 }
 
 } // namespace WebCore
 
 #endif // StyleResolver_h