Add handling to respect role attribute in AXObjects.

Source/modules/accessibility/AXObjectCacheImpl.cpp

 /*
  * Copyright (C) 2014, Google 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 241 matching lines @@
     return equalIgnoringCase(toElement(node)->getAttribute(roleAttr), role);
 }
 
 PassRefPtr<AXObject> AXObjectCacheImpl::createFromRenderer(LayoutObject* layoutObject)
 {
     // FIXME: How could layoutObject->node() ever not be an Element?
     Node* node = layoutObject->node();
 
     // If the node is aria role="list" or the aria role is empty and its a
     // ul/ol/dl type (it shouldn't be a list if aria says otherwise).
-    if (node && ((nodeHasRole(node, "list") || nodeHasRole(node, "directory"))
-        || (nodeHasRole(node, nullAtom) && (isHTMLUListElement(*node) || isHTMLOListElement(*node) || isHTMLDListElement(*node)))))
+    if (nodeHasRole(node, "list") || nodeHasRole(node, "directory")
+        || (nodeHasRole(node, nullAtom) && (isHTMLUListElement(node) || isHTMLOListElement(node) || isHTMLDListElement(node))))
         return AXList::create(layoutObject, this);
 
     // aria tables
     if (nodeHasRole(node, "grid") || nodeHasRole(node, "treegrid"))
         return AXARIAGrid::create(layoutObject, this);
     if (nodeHasRole(node, "row"))
         return AXARIAGridRow::create(layoutObject, this);
     if (nodeHasRole(node, "gridcell") || nodeHasRole(node, "columnheader") || nodeHasRole(node, "rowheader"))
         return AXARIAGridCell::create(layoutObject, this);
 
@@ skipping 847 matching lines @@
 void AXObjectCacheImpl::setCanvasObjectBounds(Element* element, const LayoutRect& rect)
 {
     AXObject* obj = getOrCreate(element);
     if (!obj)
         return;
 
     obj->setElementRect(rect);
 }
 
 } // namespace blink