Implement computedRole and computedName (behind a flag)

Source/modules/accessibility/AXTableColumn.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 16 matching lines @@
  */
 
 #ifndef AXTableColumn_h
 #define AXTableColumn_h
 
 #include "modules/accessibility/AXMockObject.h"
 #include "modules/accessibility/AXTable.h"
 
 namespace blink {
 
+class AXObjectCache;
 class RenderTableSection;
 
 class AXTableColumn final : public AXMockObject {
 
 private:
-    AXTableColumn();
+    explicit AXTableColumn(AXObjectCache*);
 public:
-    static PassRefPtr<AXTableColumn> create();
+    static PassRefPtr<AXTableColumn> create(AXObjectCache*);
     virtual ~AXTableColumn();
 
     AXObject* headerObject();
 
     virtual AccessibilityRole roleValue() const override { return ColumnRole; }
 
     void setColumnIndex(int columnIndex) { m_columnIndex = columnIndex; }
     int columnIndex() const { return m_columnIndex; }
 
     virtual void addChildren() override;
     virtual void setParent(AXObject*) override;
 
     virtual LayoutRect elementRect() const override;
 
 private:
     unsigned m_columnIndex;
     LayoutRect m_columnRect;
 
     virtual bool isTableCol() const override { return true; }
     AXObject* headerObjectForSection(RenderTableSection*, bool thTagRequired);
     virtual bool computeAccessibilityIsIgnored() const override;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXTableColumn, isTableCol());
 
 } // namespace blink
 
 #endif // AXTableColumn_h