Add handling to respect role attribute in AXObjects.

Source/modules/accessibility/AXMenuList.cpp

 /*
  * Copyright (C) 2010 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 24 matching lines @@
 AXMenuList::AXMenuList(LayoutMenuList* layoutObject, AXObjectCacheImpl* axObjectCache)
     : AXLayoutObject(layoutObject, axObjectCache)
 {
 }
 
 PassRefPtr<AXMenuList> AXMenuList::create(LayoutMenuList* layoutObject, AXObjectCacheImpl* axObjectCache)
 {
     return adoptRef(new AXMenuList(layoutObject, axObjectCache));
 }
 
+AccessibilityRole AXMenuList::roleValue() const
+{
+    AccessibilityRole ariaRole = ariaRoleAttribute();
+    if (ariaRole != UnknownRole)
+        return ariaRole;
+    return PopUpButtonRole;
+}
+
 bool AXMenuList::press() const
 {
     LayoutMenuList* menuList = toLayoutMenuList(m_layoutObject);
     if (menuList->popupIsVisible())
         menuList->hidePopup();
     else
         menuList->showPopup();
     return true;
 }
 
@@ skipping 61 matching lines @@
         if (childObjects[0]->isMenuListPopup()) {
             if (AXMenuListPopup* popup = toAXMenuListPopup(childObjects[0].get()))
                 popup->didUpdateActiveOption(optionIndex);
         }
     }
 
     cache->postNotification(this, document.get(), AXObjectCacheImpl::AXMenuListValueChanged, true);
 }
 
 } // namespace blink