Implemented scoped invalidation for added/removed RuleSets.

third_party/WebKit/Source/core/dom/StyleEngine.h

Index: third_party/WebKit/Source/core/dom/StyleEngine.h
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.h b/third_party/WebKit/Source/core/dom/StyleEngine.h
index 2e037b04b05a506737658a611e7244c750dd4131..4a8ab090d9409abc3a57940e49ae32299e753d9e 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.h
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.h
@@ -180,6 +180,7 @@ public:
     void scheduleInvalidationsForInsertedSibling(Element* beforeElement, Element& insertedElement);
     void scheduleInvalidationsForRemovedSibling(Element* beforeElement, Element& removedElement, Element& afterElement);
     void scheduleNthPseudoInvalidations(ContainerNode&);
+    void scheduleInvalidationsForRuleSets(TreeScope&, const HeapVector<Member<const RuleSet>>&);
 
     unsigned styleForElementCount() const { return m_styleForElementCount; }
     void incStyleForElementCount() { m_styleForElementCount++; }
@@ -231,6 +232,8 @@ private:
     void updateActiveStyleSheetsInShadow(StyleResolverUpdateMode, TreeScope*, UnorderedTreeScopeSet& treeScopesRemoved);
 
     bool shouldSkipInvalidationFor(const Element&) const;
+    void scheduleRuleSetInvalidationsForElement(Element&, const HeapVector<Member<const RuleSet>>&);
+    void invalidateSlottedElements(HTMLSlotElement&);
 
     Member<Document> m_document;
     bool m_isMaster;