Implement computedRole and computedName (behind a flag)

Source/modules/accessibility/AXObjectCacheImpl.h

Index: Source/modules/accessibility/AXObjectCacheImpl.h
diff --git a/Source/modules/accessibility/AXObjectCacheImpl.h b/Source/modules/accessibility/AXObjectCacheImpl.h
index 1e09aea30a88ace6f5d40f9394f5b29adf66fba4..494b54c5a38d60f08cb51b70a48e57cd5525b46a 100644
--- a/Source/modules/accessibility/AXObjectCacheImpl.h
+++ b/Source/modules/accessibility/AXObjectCacheImpl.h
@@ -103,6 +103,9 @@ public:
     void handleLayoutComplete(RenderObject*) override;
     void handleScrolledToAnchor(const Node* anchorNode) override;
 
+    virtual const AtomicString& computedRoleForNode(Node*) override;
+    virtual String computedNameForNode(Node*) override;
+
     // Returns the root object for the entire document.
     AXObject* rootObject();