Implement computedRole and computedName (behind a flag)

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 0314e34cc9618830ef32cfcfcf5974d2193b9c5b..964eeaa206be2cf006d7230c0c4b80a21cb7e988 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -2269,7 +2269,11 @@ AXObjectCache* Document::axObjectCache() const
     Settings* settings = this->settings();
     if (!settings || !settings->accessibilityEnabled())
         return 0;
+    return alwaysCreateAxObjectCache();
+}
 
+AXObjectCache* Document::alwaysCreateAxObjectCache() const
+{
     // The only document that actually has a AXObjectCache is the top-level
     // document.  This is because we need to be able to get from any WebCoreAXObject
     // to any other WebCoreAXObject on the same page.  Using a single cache allows