Implement computedRole and computedName (behind a flag)

Source/modules/accessibility/AXTableCell.h

Index: Source/modules/accessibility/AXTableCell.h
diff --git a/Source/modules/accessibility/AXTableCell.h b/Source/modules/accessibility/AXTableCell.h
index cfdc0f064a3321836eabca9fb2fd931e8da0c482..ef41e68b9e1a4e012cfc2eed47641b1050c5b02a 100644
--- a/Source/modules/accessibility/AXTableCell.h
+++ b/Source/modules/accessibility/AXTableCell.h
@@ -33,12 +33,14 @@
 
 namespace blink {
 
+class AXObjectCache;
+
 class AXTableCell : public AXRenderObject {
 
 protected:
-    explicit AXTableCell(RenderObject*);
+    AXTableCell(RenderObject*, AXObjectCache*);
 public:
-    static PassRefPtr<AXTableCell> create(RenderObject*);
+    static PassRefPtr<AXTableCell> create(RenderObject*, AXObjectCache*);
     virtual ~AXTableCell();
 
     virtual bool isTableCell() const override final;