Adds accessibility role for details element

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 173 matching lines @@
     AccessibilityRole ariaRole = ariaRoleAttribute();
     if (ariaRole != UnknownRole)
         return ariaRole;
 
     if (node()->isLink())
         return LinkRole;
     if (node()->isTextNode())
         return StaticTextRole;
     if (isHTMLButtonElement(*node()))
         return buttonRoleType();
+    if (isHTMLDetailsElement(*node()))
+        return DetailsRole;
     if (isHTMLInputElement(*node())) {
         HTMLInputElement& input = toHTMLInputElement(*node());
         const AtomicString& type = input.type();
         if (type == InputTypeNames::checkbox)
             return CheckBoxRole;
         if (type == InputTypeNames::radio)
             return RadioButtonRole;
         if (input.isTextButton())
             return buttonRoleType();
         if (type == InputTypeNames::range)
@@ skipping 1492 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