Make a separated header file for blink::CreateElementFlags

We're going to use blink::CreateElementFlags in more header files, and
would like to avoid to include huge Document.h.

This CL has no behavior changes.

Bug: 805280
Change-Id: I64c89995cda3f76f1e75b6cf20af05f0e8eb2e24
Reviewed-on: https://chromium-review.googlesource.com/888191Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532134}

third_party/WebKit/Source/core/dom/BUILD.gn

@@ -50,6 +50,7 @@ blink_core_sources("dom") {
     "ContextLifecycleNotifier.h",
     "ContextLifecycleObserver.cpp",
     "ContextLifecycleObserver.h",
+    "CreateElementFlags.h",
     "DOMException.cpp",
     "DOMException.h",
     "DOMHighResTimeStamp.h",

third_party/WebKit/Source/core/dom/CreateElementFlags.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.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef CreateElementFlags_h
+#define CreateElementFlags_h
+
+enum CreateElementFlags {
+  kCreatedByParser = 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.
+  kSynchronousCustomElements = 0 << 1,
+  kAsynchronousCustomElements = 1 << 1,
+
+  // Aliases by callers.
+  // Clone a node: https://dom.spec.whatwg.org/#concept-node-clone
+  kCreatedByCloneNode = kAsynchronousCustomElements,
+  kCreatedByImportNode = kCreatedByCloneNode,
+  // https://dom.spec.whatwg.org/#dom-document-createelement
+  kCreatedByCreateElement = kSynchronousCustomElements,
+  // https://html.spec.whatwg.org/#create-an-element-for-the-token
+  kCreatedByFragmentParser = kCreatedByParser | kAsynchronousCustomElements,
+};
+
+#endif  // CreateElementFlags_h

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

@@ -39,6 +39,7 @@
 #include "core/CoreExport.h"
 #include "core/animation/WorkletAnimationController.h"
 #include "core/dom/ContainerNode.h"
+#include "core/dom/CreateElementFlags.h"
 #include "core/dom/DocumentEncodingData.h"
 #include "core/dom/DocumentInit.h"
 #include "core/dom/DocumentLifecycle.h"
@@ -218,25 +219,6 @@ enum ShadowCascadeOrder {
   kShadowCascadeV1
 };
 
-enum CreateElementFlags {
-  kCreatedByParser = 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.
-  kSynchronousCustomElements = 0 << 1,
-  kAsynchronousCustomElements = 1 << 1,
-
-  // Aliases by callers.
-  // Clone a node: https://dom.spec.whatwg.org/#concept-node-clone
-  kCreatedByCloneNode = kAsynchronousCustomElements,
-  kCreatedByImportNode = kCreatedByCloneNode,
-  // https://dom.spec.whatwg.org/#dom-document-createelement
-  kCreatedByCreateElement = kSynchronousCustomElements,
-  // https://html.spec.whatwg.org/#create-an-element-for-the-token
-  kCreatedByFragmentParser = kCreatedByParser | kAsynchronousCustomElements,
-};
-
 // Collect data about deferred loading of offscreen cross-origin documents. All
 // cross-origin documents log Created. Only those that would load log a reason.
 // We can then see the % of cross-origin documents that never have to load.