Prepare to use invalidation set for adding/removing RuleSets.

third_party/WebKit/Source/core/css/RuleSet.h

Index: third_party/WebKit/Source/core/css/RuleSet.h
diff --git a/third_party/WebKit/Source/core/css/RuleSet.h b/third_party/WebKit/Source/core/css/RuleSet.h
index 9f310e0d7e6b004c1415db3a6372a01c27936d33..8f66de8d6f03dabf257159a4617aceaebf3ac846 100644
--- a/third_party/WebKit/Source/core/css/RuleSet.h
+++ b/third_party/WebKit/Source/core/css/RuleSet.h
@@ -170,6 +170,20 @@ public:
         compactRules();
     }
 
+    bool hasSlottedRules() const { return !m_slottedPseudoElementRules.isEmpty(); }
+
+    bool hasV0BoundaryCrossingRules() const
+    {
+        return !m_deepCombinatorOrShadowPseudoRules.isEmpty()
+            || !m_contentPseudoElementRules.isEmpty();
+    }
+
+    bool needsFullRecalcForRuleSetInvalidation() const
+    {
+        return m_features.needsFullRecalcForRuleSetInvalidation()
+            || hasV0BoundaryCrossingRules();
+    }
+
 #ifndef NDEBUG
     void show() const;
 #endif