Use invalidation sets for :hover, :active, and :focus.

Source/core/css/RuleFeature.h

Index: Source/core/css/RuleFeature.h
diff --git a/Source/core/css/RuleFeature.h b/Source/core/css/RuleFeature.h
index b83f357bf04ef89ba6663677dab3e152f6447bb7..5eeb6f1504548ca72ea3c559bef428ed5344729b 100644
--- a/Source/core/css/RuleFeature.h
+++ b/Source/core/css/RuleFeature.h
@@ -22,6 +22,7 @@
 #ifndef RuleFeature_h
 #define RuleFeature_h
 
+#include "core/css/CSSSelector.h"
 #include "core/css/invalidation/DescendantInvalidationSet.h"
 #include "core/css/invalidation/StyleInvalidator.h"
 #include "wtf/Forward.h"
@@ -30,7 +31,6 @@
 
 namespace WebCore {
 
-class CSSSelector;
 class CSSSelectorList;
 class Document;
 class Node;
@@ -87,10 +87,9 @@ public:
 
     void scheduleStyleInvalidationForClassChange(const SpaceSplitString& changedClasses, Element&);
     void scheduleStyleInvalidationForClassChange(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses, Element&);
-
     void scheduleStyleInvalidationForAttributeChange(const QualifiedName& attributeName, Element&);
-
     void scheduleStyleInvalidationForIdChange(const AtomicString& oldId, const AtomicString& newId, Element&);
+    void scheduleStyleInvalidationForPseudoChange(CSSSelector::PseudoType, Element&);
 
     bool hasIdsInSelectors() const
     {
@@ -109,6 +108,7 @@ public:
 
 private:
     typedef HashMap<AtomicString, RefPtr<DescendantInvalidationSet> > InvalidationSetMap;
+    typedef HashMap<CSSSelector::PseudoType, RefPtr<DescendantInvalidationSet>, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned> > PseudoTypeInvalidationSetMap;
 
     struct FeatureMetadata {
         FeatureMetadata()
@@ -132,13 +132,14 @@ private:
 
     static InvalidationSetMode invalidationSetModeForSelector(const CSSSelector&);
 
-    void collectFeaturesFromSelector(const CSSSelector&, FeatureMetadata&, InvalidationSetMode);
-    void collectFeaturesFromSelectorList(const CSSSelectorList*, FeatureMetadata&, InvalidationSetMode);
+    void collectFeaturesFromSelector(const CSSSelector&, FeatureMetadata&, InvalidationSetMode, bool seenCombinator);
+    void collectFeaturesFromSelectorList(const CSSSelectorList*, FeatureMetadata&, InvalidationSetMode, bool seenCombinator);
 
     DescendantInvalidationSet& ensureClassInvalidationSet(const AtomicString& className);
     DescendantInvalidationSet& ensureAttributeInvalidationSet(const AtomicString& attributeName);
     DescendantInvalidationSet& ensureIdInvalidationSet(const AtomicString& attributeName);
-    DescendantInvalidationSet* invalidationSetForSelector(const CSSSelector&);
+    DescendantInvalidationSet& ensurePseudoInvalidationSet(CSSSelector::PseudoType);
+    DescendantInvalidationSet* invalidationSetForSelector(const CSSSelector&, bool seenCombinator);
 
     InvalidationSetMode updateInvalidationSets(const CSSSelector&);
 
@@ -161,6 +162,7 @@ private:
     InvalidationSetMap m_classInvalidationSets;
     InvalidationSetMap m_attributeInvalidationSets;
     InvalidationSetMap m_idInvalidationSets;
+    PseudoTypeInvalidationSetMap m_pseudoInvalidationSets;
     bool m_targetedStyleRecalcEnabled;
     StyleInvalidator m_styleInvalidator;
 };