Implement aria properties setsize and posinset.

Source/modules/accessibility/AXObject.cpp

Index: Source/modules/accessibility/AXObject.cpp
diff --git a/Source/modules/accessibility/AXObject.cpp b/Source/modules/accessibility/AXObject.cpp
index 55c4a517c4e225c8aea22265ddab2e4bd875aa22..884745d3dbcec62653cad311c1923365f686e462 100644
--- a/Source/modules/accessibility/AXObject.cpp
+++ b/Source/modules/accessibility/AXObject.cpp
@@ -719,6 +719,17 @@ bool AXObject::supportsRangeValue() const
         || isSpinButton();
 }
 
+bool AXObject::supportssetSizePosInSet() const
+{
+    if (parentObject() && ((roleValue() == ListBoxOptionRole && parentObject()->roleValue() == ListBoxRole)

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

I'd like your feedback on this check condition.

[dmazzoni, 2015/04/09 15:19:20]

This looks right, but it should also apply to ListItemRole with a parent of
ListRole, and TreeItemRole with a parent of TreeRole or TreeItemRole (tree items
can be nested).

Oh, and also MenuListOptionRole with a a parent of MenuListRole.

I think that's all, but you can check the ARIA spec for aria-posinset and you
can look over the list of roles to see if any others look like list-like roles.

I'd write it using a few more lines of code to make it more readable, something
like:

AXObject* parent = parentObject();
if (!parent)
    return false;

int role = roleValue();
int parentRole = parent->roleValue();

if ((role == ListItemRole && parentRole == ListRole)
    || (role == ListBoxOptionRole && parentRole == ListBoxRole)
...

+        || (roleValue() == ListItemRole && parentObject()->roleValue() == ListRole)
+        || (roleValue() == RadioButtonRole && parentObject()->roleValue() == RadioGroupRole)
+        || (roleValue() == TabRole && parentObject()->roleValue() == TabListRole)))
+            return true;
+
+    return false;
+}
+
 void AXObject::ariaTreeRows(AccessibilityChildrenVector& result)
 {
     for (const auto& child : children()) {