Process Custom Elements in post-order.

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index b7147bcdc8263c6523a9ad5185c958c065f00580..1ee75dcaedbae7677c093c55cacff558e3890514 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -953,7 +953,7 @@ void Element::attributeChanged(const QualifiedName& name, const AtomicString& ne
 inline void Element::attributeChangedFromParserOrByCloning(const QualifiedName& name, const AtomicString& newValue, AttributeModificationReason reason)
 {
     if (name == isAttr)
-        CustomElementRegistrationContext::setTypeExtension(this, newValue);
+        CustomElementRegistrationContext::setTypeExtension(this, newValue, reason == ModifiedDirectly ? CustomElementRegistrationContext::CreatedByParser : CustomElementRegistrationContext::CreatedByCloning);
     attributeChanged(name, newValue, reason);
 }
 
@@ -1770,6 +1770,8 @@ void Element::finishParsingChildren()
     checkForSiblingStyleChanges(this, renderStyle(), true, lastChild(), 0, 0);
     if (StyleResolver* styleResolver = document()->styleResolverIfExists())
         styleResolver->popParentElement(this);
+    if (isCustomElement())
+        CustomElement::finishedParsingChildren(this);
 }
 
 #ifndef NDEBUG