Implement aria properties setsize and posinset.

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 1154 matching lines @@
         WillBeHeapVector<RefPtrWillBeMember<HTMLFormControlElement>>
             invalidControls;
         bool isInvalid = !element->checkValidity(
             &invalidControls, CheckValidityDispatchNoEvent);
         return isInvalid ? InvalidStateTrue : InvalidStateFalse;
     }
 
     return InvalidStateUndefined;
 }
 
+int AXNodeObject::posInSet() const
+{
+    if (supportssetSizePosInSet()) {

[dmazzoni, 2015/04/09 15:15:37]

nit: how about supportsSetSizeAndPosInSet

+        if (hasAttribute(aria_posinsetAttr))
+            return getAttribute(aria_posinsetAttr).toInt();
+        return node()->nodeIndex();

[shreeramk, 2015/04/09 13:50:15]

And this to get index?

Is this correct API to get child's index in parent?

[dmazzoni, 2015/04/09 15:15:37]

Yes

+    }
+
+    return 0;
+}
+
+int AXNodeObject::setSize() const
+{
+    if (supportssetSizePosInSet()) {
+        if (hasAttribute(aria_setsizeAttr))
+            return getAttribute(aria_setsizeAttr).toInt();
+        return node()->parentNode()->countChildren();

[shreeramk, 2015/04/09 13:50:15]

Is this correct API to get the child count of parent?

[dmazzoni, 2015/04/09 15:15:37]

Yes, but please check that parentNode() is not null just in case

+    }
+
+    return 0;
+}
+
 String AXNodeObject::ariaInvalidValue() const
 {
     if (invalidState() == InvalidStateOther)
         return getAttribute(aria_invalidAttr);
 
     return String();
 }
 
 String AXNodeObject::valueDescription() const
 {
@@ skipping 897 matching lines @@
     float range = maxValueForRange() - minValueForRange();
     float value = valueForRange();
 
     value += range * (percentChange / 100);
     setValue(String::number(value));
 
     axObjectCache()->postNotification(node(), AXObjectCacheImpl::AXValueChanged);
 }
 
 } // namespace blink