Process Custom Elements in post-order.

Source/core/scripts/make_names.pl

Index: Source/core/scripts/make_names.pl
diff --git a/Source/core/scripts/make_names.pl b/Source/core/scripts/make_names.pl
index 5fa77e238b48b5156a129aafd9e9c8af56f3c01e..15d0d77089f314d80ebd9ed37f0b6f49f3fce5c8 100755
--- a/Source/core/scripts/make_names.pl
+++ b/Source/core/scripts/make_names.pl
@@ -860,7 +860,7 @@ print F <<END
         return 0;
 
     if (CustomElement::isCustomTagName(qName.localName()) && document->registrationContext()) {
-        RefPtr<Element> element = document->registrationContext()->createCustomTagElement(document, qName);
+        RefPtr<Element> element = document->registrationContext()->createCustomTagElement(document, qName, createdByParser ? CustomElementRegistrationContext::CreatedByParser : CustomElementRegistrationContext::NotCreatedByParser);
         ASSERT_WITH_SECURITY_IMPLICATION(element->is$parameters{namespace}Element());
         return static_pointer_cast<$parameters{namespace}Element>(element.release());
     }