Skip traversing wholeSubtree subtrees with clean invalidation bits.

Source/core/css/invalidation/StyleInvalidator.h

Index: Source/core/css/invalidation/StyleInvalidator.h
diff --git a/Source/core/css/invalidation/StyleInvalidator.h b/Source/core/css/invalidation/StyleInvalidator.h
index 146c04741660d24dd9be7b5f6eb9317e8a91458a..275c6c8c8e6d296aaacde51d78d357de82a63b43 100644
--- a/Source/core/css/invalidation/StyleInvalidator.h
+++ b/Source/core/css/invalidation/StyleInvalidator.h
@@ -43,7 +43,7 @@ private:
 
         void pushInvalidationSet(const DescendantInvalidationSet&);
         bool matchesCurrentInvalidationSets(Element&);
-        bool hasInvalidationSets() const { return m_invalidationSets.size(); }
+        bool hasInvalidationSets() const { return !wholeSubtreeInvalid() && m_invalidationSets.size(); }
 
         bool wholeSubtreeInvalid() const { return m_wholeSubtreeInvalid; }
         void setWholeSubtreeInvalid() { m_wholeSubtreeInvalid = true; }