Change "bool createdByParser" of createElement() to enum

third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp b/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
index e40177f6081aa854534c78ef80d5941220094e16..0e0a893328f36f9b798b612b34e38c1c73a1237a 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
@@ -738,10 +738,18 @@ void HTMLConstructionSite::takeAllChildren(HTMLStackItem* newParent, HTMLElement
     queueTask(task);
 }
 
+CreateElementFlags HTMLConstructionSite::getCreateElementFlags() const
+{
+    // Set SynchronousCustomElements if not for HTML fragment parsing algorithm.
+    // https://html.spec.whatwg.org/#create-an-element-for-the-token
+    return static_cast<CreateElementFlags>(CreatedByParser
+        | (m_isParsingFragment ? AsynchronousCustomElements : SynchronousCustomElements));
+}
+
 Element* HTMLConstructionSite::createElement(AtomicHTMLToken* token, const AtomicString& namespaceURI)
 {
     QualifiedName tagName(nullAtom, token->name(), namespaceURI);
-    Element* element = ownerDocumentForCurrentNode().createElement(tagName, true);
+    Element* element = ownerDocumentForCurrentNode().createElement(tagName, getCreateElementFlags());
     setAttributes(element, token, m_parserContentPolicy);
     return element;
 }
@@ -762,7 +770,7 @@ HTMLElement* HTMLConstructionSite::createHTMLElement(AtomicHTMLToken* token)
     // FIXME: This can't use HTMLConstructionSite::createElement because we
     // have to pass the current form element.  We should rework form association
     // to occur after construction to allow better code sharing here.
-    HTMLElement* element = HTMLElementFactory::createHTMLElement(token->name(), document, form, true);
+    HTMLElement* element = HTMLElementFactory::createHTMLElement(token->name(), document, form, getCreateElementFlags());
     setAttributes(element, token, m_parserContentPolicy);
     return element;
 }