Implement style invalidation tree walk for targeted style recalc upon class change.

Source/core/dom/shadow/SelectRuleFeatureSet.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef SelectRuleFeatureSet_h
 #define SelectRuleFeatureSet_h
 
 #include "core/css/RuleFeature.h"
 #include "core/dom/Element.h"
 
 namespace WebCore {
 
+class Element;
+class SpaceSplitString;
+
 class SelectRuleFeatureSet {
 public:
     SelectRuleFeatureSet();
 
     void add(const SelectRuleFeatureSet&);
     void clear();
     void collectFeaturesFromSelector(const CSSSelector*);
 
     bool hasSelectorForId(const AtomicString&) const;
     bool hasSelectorForClass(const AtomicString&) const;
     bool hasSelectorForAttribute(const AtomicString&) const;
 
     bool hasSelectorForChecked() const { return hasSelectorFor(AffectedSelectorChecked); }
     bool hasSelectorForEnabled() const { return hasSelectorFor(AffectedSelectorEnabled); }
     bool hasSelectorForDisabled() const { return hasSelectorFor(AffectedSelectorDisabled); }
     bool hasSelectorForIndeterminate() const { return hasSelectorFor(AffectedSelectorIndeterminate); }
     bool hasSelectorForLink() const { return hasSelectorFor(AffectedSelectorLink); }
     bool hasSelectorForTarget() const { return hasSelectorFor(AffectedSelectorTarget); }
     bool hasSelectorForVisited() const { return hasSelectorFor(AffectedSelectorVisited); }
 
     bool hasSelectorFor(AffectedSelectorMask features) const { return m_featureFlags & features; }
 
+    bool checkSelectorsForClassChange(const SpaceSplitString& changedClasses) const;
+    bool checkSelectorsForClassChange(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses) const;
+
 private:
     void setSelectRuleFeature(AffectedSelectorType feature) { m_featureFlags |= feature; }
 
     RuleFeatureSet m_cssRuleFeatureSet;
     int m_featureFlags;
 };
 
 inline bool SelectRuleFeatureSet::hasSelectorForId(const AtomicString& idValue) const
 {
     ASSERT(!idValue.isEmpty());
     return m_cssRuleFeatureSet.hasSelectorForId(idValue);
 }
 
 inline bool SelectRuleFeatureSet::hasSelectorForClass(const AtomicString& classValue) const
 {
     ASSERT(!classValue.isEmpty());
     return m_cssRuleFeatureSet.hasSelectorForClass(classValue);
 }
 
 inline bool SelectRuleFeatureSet::hasSelectorForAttribute(const AtomicString& attributeName) const
 {
     ASSERT(!attributeName.isEmpty());
     return m_cssRuleFeatureSet.hasSelectorForAttribute(attributeName);
 }
 
 }
 
 #endif