Adding support for ARIA 1.1 role="none"

Source/core/accessibility/AXNodeObject.cpp

 /*
 * Copyright (C) 2012, 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 226 matching lines @@
 }
 
 AccessibilityRole AXNodeObject::determineAriaRoleAttribute() const
 {
     const AtomicString& ariaRole = getAttribute(roleAttr);
     if (ariaRole.isNull() || ariaRole.isEmpty())
         return UnknownRole;
 
     AccessibilityRole role = ariaRoleToWebCoreRole(ariaRole);
 
-    // ARIA states if an item can get focus, it should not be presentational.
-    if (role == PresentationalRole && canSetFocusAttribute())
+    // ARIA states if an item can get focus, it should not be none or presentational.
+    if ((role == NoneRole || role == PresentationalRole) && canSetFocusAttribute())
         return UnknownRole;
 
     if (role == ButtonRole)
         role = buttonRoleType();
 
     if (role == TextAreaRole && !ariaIsMultiline())
         role = TextFieldRole;
 
     role = remapAriaRoleDueToParent(role);
 
@@ skipping 1437 matching lines @@
     float range = maxValueForRange() - minValueForRange();
     float value = valueForRange();
 
     value += range * (percentChange / 100);
     setValue(String::number(value));
 
     axObjectCache()->postNotification(node(), AXObjectCache::AXValueChanged, true);
 }
 
 } // namespace blink