Implement computedRole and computedName (behind a flag)

Source/modules/accessibility/AXListBox.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AXListBox_h
 #define AXListBox_h
 
 #include "modules/accessibility/AXRenderObject.h"
 
 namespace blink {
 
+class AXObjectCache;
+
 class AXListBox final : public AXRenderObject {
 
 private:
-    explicit AXListBox(RenderObject*);
+    AXListBox(RenderObject*, AXObjectCache*);
+
 public:
-    static PassRefPtr<AXListBox> create(RenderObject*);
+    static PassRefPtr<AXListBox> create(RenderObject*, AXObjectCache*);
     virtual ~AXListBox();
 
     virtual AccessibilityRole roleValue() const override { return ListBoxRole; }
 };
 
 } // namespace blink
 
 #endif // AXListBox_h