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..0e399ac1ff34a7375ca8602d0b3cc1f5766d7e3a 100644
--- a/Source/core/css/RuleFeature.h
+++ b/Source/core/css/RuleFeature.h
@@ -87,6 +87,9 @@ public:
 
     void scheduleStyleInvalidationForClassChange(const SpaceSplitString& changedClasses, Element&);
     void scheduleStyleInvalidationForClassChange(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses, Element&);
+    void scheduleStyleInvalidationForHoverChange(Element&);
+    void scheduleStyleInvalidationForActiveChange(Element&);
+    void scheduleStyleInvalidationForFocusChange(Element&);
 
     void scheduleStyleInvalidationForAttributeChange(const QualifiedName& attributeName, Element&);
 
@@ -132,13 +135,16 @@ 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& ensureHoverInvalidationSet();
+    DescendantInvalidationSet& ensureActiveInvalidationSet();
+    DescendantInvalidationSet& ensureFocusInvalidationSet();
+    DescendantInvalidationSet* invalidationSetForSelector(const CSSSelector&, bool seenCombinator);
 
     InvalidationSetMode updateInvalidationSets(const CSSSelector&);
 
@@ -161,6 +167,9 @@ private:
     InvalidationSetMap m_classInvalidationSets;
     InvalidationSetMap m_attributeInvalidationSets;
     InvalidationSetMap m_idInvalidationSets;
+    RefPtr<DescendantInvalidationSet> m_hoverInvalidationSet;
+    RefPtr<DescendantInvalidationSet> m_activeInvalidationSet;
+    RefPtr<DescendantInvalidationSet> m_focusInvalidationSet;
     bool m_targetedStyleRecalcEnabled;
     StyleInvalidator m_styleInvalidator;
 };