Implement "create an element" when sync for Custom Element V1

third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp

Index: third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp b/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
index 8a315ac28147b5eda6aa7dbba804fa25d43d6af4..d4b7049f5f97616aa08e615c2d5760ff12e0cad8 100644
--- a/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
@@ -55,12 +55,13 @@ void V8HTMLElement::constructorCustom(
     Element* element;
     if (definition->constructionStack().isEmpty()) {
         // This is an element being created with 'new' from script
-        element = window->document()->createElement(
-            definition->descriptor().localName(),
-            AtomicString(),
-            exceptionState);
-        if (exceptionState.throwIfNeeded())
-            return;
+        // TODO(kojii): When HTMLElementFactory has an option not to queue
+        // upgrade, call that instead of HTMLElement. HTMLElement is enough
+        // for now, but type extension will require HTMLElementFactory.
+        element = HTMLElement::create(
+            QualifiedName(nullAtom, definition->descriptor().localName(), HTMLNames::xhtmlNamespaceURI),
+            *window->document());
+        element->setCustomElementState(CustomElementState::Undefined);
     } else {
         element = definition->constructionStack().last();
         if (element) {
@@ -91,11 +92,6 @@ void V8HTMLElement::constructorCustom(
         scriptState->context(),
         definition->prototype()));
 
-    // TODO(dominicc): These elements should be 'undefined', not
-    // 'uncustomized', on creation. Investigate why some elements are
-    // running around uncustomized.
-    if (element->getCustomElementState() == CustomElementState::Uncustomized)
-        element->setCustomElementState(CustomElementState::Undefined);
     // TODO(dominicc): Move this to the exactly correct place when
     // https://github.com/whatwg/html/issues/1297 is closed.
     element->setCustomElementState(CustomElementState::Custom);