Re-land: Initial skeleton of Accessibility Object Model Phase 1

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

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef AccessibleNode_h
+#define AccessibleNode_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
+#include "wtf/HashMap.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/AtomicStringHash.h"
+
+namespace blink {
+
+class Element;
+
+// All of the properties of AccessibleNode that have type "string".
+// TODO(dmazzoni): Add similar enums for all of the properties with
+// type bool, float, reference, and reference list.
+enum class AOMStringProperty { kRole, kLabel };
+
+// Accessibility Object Model node
+// Explainer: https://github.com/WICG/aom/blob/master/explainer.md
+// Spec: https://wicg.github.io/aom/spec/
+class CORE_EXPORT AccessibleNode
+    : public GarbageCollectedFinalized<AccessibleNode>,
+      public ScriptWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  explicit AccessibleNode(Element*);
+  virtual ~AccessibleNode();
+
+  // Returns the given string property if the Element has an AccessibleNode,
+  // otherwise returns the equivalent ARIA attribute.
+  static const AtomicString& getProperty(Element*, AOMStringProperty);
+
+  AtomicString role() const;
+  void setRole(const AtomicString&);
+
+  AtomicString label() const;
+  void setLabel(const AtomicString&);
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  void setStringProperty(AOMStringProperty, const AtomicString&);
+
+  Vector<std::pair<AOMStringProperty, AtomicString>> m_stringProperties;
+
+  // This object's owner Element.
+  Member<Element> m_element;
+};
+
+}  // namespace blink
+
+#endif  // AccessibleNode_h