Use LocalStyleChange for classes in rightmost compound selector.

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 c26efb6c89d376d38cac44876a10789b13b9c0c4..2b4ba5fa89260f3b20f61246c6a863d5694f7937 100644
--- a/Source/core/css/RuleFeature.h
+++ b/Source/core/css/RuleFeature.h
@@ -120,16 +120,19 @@ private:
         HashSet<AtomicString> attrsInRules;
     };
 
-    enum SelectorFeatureCollectionMode {
-        ProcessClasses,
-        DontProcessClasses
+    enum InvalidationMode {
+        UseInvalidationSets,
+        UseLocalStyleChange,
+        UseSubtreeStyleChange
     };
 
-    void collectFeaturesFromSelector(const CSSSelector&, FeatureMetadata&, SelectorFeatureCollectionMode processClasses);
-    void collectFeaturesFromSelectorList(const CSSSelectorList*, FeatureMetadata&, SelectorFeatureCollectionMode processClasses);
+    static InvalidationMode supportsClassDescendantInvalidation(const CSSSelector&);
+
+    void collectFeaturesFromSelector(const CSSSelector&, FeatureMetadata&, InvalidationMode);
+    void collectFeaturesFromSelectorList(const CSSSelectorList*, FeatureMetadata&, InvalidationMode);
 
     DescendantInvalidationSet& ensureClassInvalidationSet(const AtomicString& className);
-    bool updateClassInvalidationSets(const CSSSelector&);
+    InvalidationMode updateClassInvalidationSets(const CSSSelector&);
 
     void addClassToInvalidationSet(const AtomicString& className, Element*);