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

third_party/WebKit/Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 200 matching lines @@
 enum ShadowCascadeOrder {
     ShadowCascadeNone,
     ShadowCascadeV0,
     ShadowCascadeV1
 };
 
 enum CreateElementFlags {
     CreatedByParser = 1 << 0,
     // Synchronous custom elements flag:
     // https://dom.spec.whatwg.org/#concept-create-element
+    // TODO(kojii): Remove these flags, add an option not to queue upgrade, and
+    // let parser/DOM methods to upgrade synchronously when necessary.
     SynchronousCustomElements = 0 << 1,
     AsynchronousCustomElements = 1 << 1,
 
     // Aliases by callers.
     // Clone a node: https://dom.spec.whatwg.org/#concept-node-clone
     CreatedByCloneNode = AsynchronousCustomElements,
     CreatedByImportNode = CreatedByCloneNode,
     // https://dom.spec.whatwg.org/#dom-document-createelement
     CreatedByCreateElement = SynchronousCustomElements,
     // https://html.spec.whatwg.org/#create-an-element-for-the-token
@@ skipping 1222 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h