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

third_party/WebKit/Source/modules/accessibility/AXObject.h

Index: third_party/WebKit/Source/modules/accessibility/AXObject.h
diff --git a/third_party/WebKit/Source/modules/accessibility/AXObject.h b/third_party/WebKit/Source/modules/accessibility/AXObject.h
index ac9b47f066320ea2c1afdc63ffd26cbba32f476e..b918b012f02f899a4bf8f56d06338906a4f499f3 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXObject.h
+++ b/third_party/WebKit/Source/modules/accessibility/AXObject.h
@@ -53,6 +53,8 @@ class Node;
 class LayoutObject;
 class ScrollableArea;
 
+enum class AOMStringProperty;
+
 typedef unsigned AXID;
 
 enum AccessibilityRole {
@@ -599,6 +601,12 @@ class MODULES_EXPORT AXObject : public GarbageCollectedFinalized<AXObject> {
 
   AXID axObjectID() const { return m_id; }
 
+  // Wrappers that retrieve either an Accessibility Object Model property,
+  // or the equivalent ARIA attribute, in that order.
+  // TODO(dmazzoni): Add equivalents for other types of properties besides
+  // just strings.
+  const AtomicString& getAOMPropertyOrARIAAttribute(AOMStringProperty) const;
+
   virtual void getSparseAXAttributes(AXSparseAttributeClient&) const {}
 
   // Determine subclass type.