Implement computedRole and computedName (behind a flag)

Source/core/dom/AXObjectCache.h

Index: Source/core/dom/AXObjectCache.h
diff --git a/Source/core/dom/AXObjectCache.h b/Source/core/dom/AXObjectCache.h
index a389c0d7f446208d0f70627e9f63122190d1accf..975bb539d9788719d921dfaf99a9f4d31da6e4a6 100644
--- a/Source/core/dom/AXObjectCache.h
+++ b/Source/core/dom/AXObjectCache.h
@@ -120,10 +120,28 @@ public:
     virtual void handleLayoutComplete(RenderObject*) = 0;
     virtual void handleScrolledToAnchor(const Node* anchorNode) = 0;
 
+    virtual const AtomicString& computedRoleForNode(Node*) = 0;
+    virtual String computedNameForNode(Node*) = 0;
+
 protected:
     AXObjectCache();
 };
 
+class ScopedAXObjectCache {
+    WTF_MAKE_NONCOPYABLE(ScopedAXObjectCache);
+public:
+    explicit ScopedAXObjectCache(Document&);
+    ~ScopedAXObjectCache();
+
+    AXObjectCache* get();
+    AXObjectCache* operator->();
+
+private:
+    Document& m_document;
+    AXObjectCache* m_cache;
+    bool m_isScoped;
+};
+
 }
 
 #endif