Avoid calling markAncestorsWithChildNeedsStyleRecalc() constantly in childrenChanged

Source/core/dom/Element.h

Index: Source/core/dom/Element.h
diff --git a/Source/core/dom/Element.h b/Source/core/dom/Element.h
index f298a23c6f26069154a7448f773f8f77a03ff3f6..6e16014fe63c85a5ad0a2c390a40b49a1460704e 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -828,6 +828,8 @@ inline Node::InsertionNotificationRequest Node::insertedInto(ContainerNode* inse
         setFlag(IsInShadowTreeFlag);
     if (childNeedsDistributionRecalc() && !insertionPoint->childNeedsDistributionRecalc())
         insertionPoint->markAncestorsWithChildNeedsDistributionRecalc();
+    if (!insertionPoint->childNeedsStyleRecalc())
+        insertionPoint->markAncestorsWithChildNeedsStyleRecalc();
     return InsertionDone;
 }