Initial skeleton of Accessibility Object Model Phase 1

third_party/WebKit/Source/modules/accessibility/AccessibleNode.cpp

Index: third_party/WebKit/Source/modules/accessibility/AccessibleNode.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AccessibleNode.cpp b/third_party/WebKit/Source/modules/accessibility/AccessibleNode.cpp
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index 0000000000000000000000000000000000000000..2a9b29b7bf21c397854402e7baca10fd3d5d3c23
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+++ b/third_party/WebKit/Source/modules/accessibility/AccessibleNode.cpp
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+// 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.
+
+#include "modules/accessibility/AccessibleNode.h"
+
+#include "core/frame/Settings.h"
+#include "modules/accessibility/AXObject.h"
+#include "modules/accessibility/AXObjectCacheImpl.h"
+
+namespace blink {
+
+AccessibleNode::AccessibleNode(AXObject* axObject) : m_axObject(axObject) {
+  DCHECK(RuntimeEnabledFeatures::accessibilityObjectModelEnabled());
+}
+
+AccessibleNode::~AccessibleNode() {}
+
+const AtomicString& AccessibleNode::getProperty(
+    AomStringProperty property) const {
+  const AtomicString& result = m_stringProperties.at(property);
+  if (result.isNull())
+    return nullAtom;
+
+  switch (property) {
+    case AomStringProperty::Role:
+      if (AXObject::ariaRoleToWebCoreRole(result) == UnknownRole)
+        return nullAtom;
+      break;
+    case AomStringProperty::Label:
+      // No validation needed.
+      break;
+    case AomStringProperty::None:
+      NOTREACHED();
+      return nullAtom;
+  }
+
+  return result;
+}
+
+String AccessibleNode::role() const {
+  return getProperty(AomStringProperty::Role);
+}
+
+void AccessibleNode::setRole(const String& role) {
+  m_stringProperties.set(AomStringProperty::Role, AtomicString(role));
+  if (m_axObject) {
+    m_axObject->updateAccessibilityRole();
+    m_axObject->notifyIfIgnoredValueChanged();
+  }
+}
+
+String AccessibleNode::label() const {
+  return getProperty(AomStringProperty::Label);
+}
+
+void AccessibleNode::setLabel(const String& label) {
+  m_stringProperties.set(AomStringProperty::Label, AtomicString(label));
+  if (m_axObject)
+    m_axObject->axObjectCache().textChanged(m_axObject);
+}
+
+DEFINE_TRACE(AccessibleNode) {
+  visitor->trace(m_axObject);
+}
+
+}  // namespace blink