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 2a41ee43d2a4c56f7b6b90aa85d5f2b4ce9e7ebc..12fe590e149cc84b33651e13c2c10daa57823da6 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::NotCreatedByParser);
     attributeChanged(name, newValue, reason);
 }
 
@@ -1784,6 +1784,8 @@ void Element::finishParsingChildren()
     checkForSiblingStyleChanges(this, renderStyle(), true, lastChild(), 0, 0);
     if (StyleResolver* styleResolver = document()->styleResolverIfExists())
         styleResolver->popParentElement(this);
+    if (isCustomElement())
+        CustomElement::didFinishParsingChildren(this);
 }
 
 #ifndef NDEBUG