Don't schedule invalidations when attributes changed if not needed or incorrect.

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 da5786fbbe97d0a6fb29a64b07b1db197598a40b..9fc4d1961116a1b362769cbf20f6571d3a58db93 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -816,6 +816,7 @@ inline bool Node::hasClass() const
 
 inline Node::InsertionNotificationRequest Node::insertedInto(ContainerNode* insertionPoint)
 {
+    ASSERT(!childNeedsStyleInvalidation() && !needsStyleInvalidation());

[esprehn, 2014/05/08 05:19:06]

ditto

[chrishtr, 2014/05/08 05:29:18]

Done.

     ASSERT(insertionPoint->inDocument() || isContainerNode());
     if (insertionPoint->inDocument())
         setFlag(InDocumentFlag);