posinset and setsize for input type, radio, exposed in AX tree

third_party/WebKit/Source/modules/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 1277 matching lines @@
         WillBeHeapVector<RefPtrWillBeMember<HTMLFormControlElement>>
             invalidControls;
         bool isInvalid = !element->checkValidity(
             &invalidControls, CheckValidityDispatchNoEvent);
         return isInvalid ? InvalidStateTrue : InvalidStateFalse;
     }
 
     return InvalidStateUndefined;
 }
 
+int AXNodeObject::positionInRadioGroup() const
+{
+    if (!isHTMLInputElement(node()))
+        return 0;
+
+    HTMLInputElement& input = toHTMLInputElement(*node());
+    const AtomicString& type = input.type();
+    if (type != InputTypeNames::radio)
+        return 0;
+
+    int pos = input.posInRadioGroup();
+    // If it has no pos in Group, it means that there is only itself.
+    if (!pos)
+        return 1;
+    return pos;
+
+}
+
+int AXNodeObject::sizeOfRadioGroup() const
+{
+    if (!isHTMLInputElement(node()))
+        return 0;
+
+    HTMLInputElement& input = toHTMLInputElement(*node());
+    const AtomicString& type = input.type();
+    if (type != InputTypeNames::radio)
+        return 0;
+
+    int size = input.sizeOfRadioGroup();
+    // If it has no size in Group, it means that there is only itself.
+    if (!size)
+        return 1;
+    return size;
+
+}
+
 int AXNodeObject::posInSet() const
 {
     if (supportsSetSizeAndPosInSet()) {
         if (hasAttribute(aria_posinsetAttr))
             return getAttribute(aria_posinsetAttr).toInt();
+
+        if (int position = positionInRadioGroup())
+            return position;
+
         return AXObject::indexInParent() + 1;
     }
 
     return 0;
 }
 
 int AXNodeObject::setSize() const
 {
     if (supportsSetSizeAndPosInSet()) {
         if (hasAttribute(aria_setsizeAttr))
             return getAttribute(aria_setsizeAttr).toInt();
 
+        if (int size = sizeOfRadioGroup())
+            return size;
+
         if (parentObject()) {
             const auto& siblings = parentObject()->children();
             return siblings.size();
         }
     }
 
     return 0;
 }
 
 String AXNodeObject::ariaInvalidValue() const
@@ skipping 1416 matching lines @@
     return placeholder;
 }
 
 DEFINE_TRACE(AXNodeObject)
 {
     visitor->trace(m_node);
     AXObject::trace(visitor);
 }
 
 } // namespace blin