Adding roles in Blink side to expose menuitemcheckbox & menuitemradio role with correct IA2 role.

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 1202 matching lines @@
     case PopUpButtonRole:
         // Native popup buttons should not use their button children's text as a title. That value is retrieved through stringValue().
         if (isHTMLSelectElement(*node))
             return String();
     case ButtonRole:
     case ToggleButtonRole:
     case CheckBoxRole:
     case ListBoxOptionRole:
     case MenuButtonRole:
     case MenuItemRole:
+    case MenuItemCheckBoxRole:
+    case MenuItemRadioRole:
     case RadioButtonRole:
     case TabRole:
         return textUnderElement();
     // SVGRoots should not use the text under itself as a title. That could include the text of objects like <text>.
     case SVGRootRole:
         return String();
     default:
         break;
     }
 
@@ skipping 232 matching lines @@
 
     if (isHTMLSelectElement(*node))
         return toElement(node);
 
     switch (roleValue()) {
     case ButtonRole:
     case PopUpButtonRole:
     case ToggleButtonRole:
     case TabRole:
     case MenuItemRole:
+    case MenuItemCheckBoxRole:
+    case MenuItemRadioRole:
     case ListItemRole:
         return toElement(node);
     default:
         break;
     }
 
     Element* elt = anchorElement();
     if (!elt)
         elt = mouseButtonListener();
     return elt;
@@ skipping 252 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