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

third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
index 08f58880ed500c446aa4c17ab1a9176d3ad49b8f..503cec0b57e6f92481d0dcb6f656c39e443885b9 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
@@ -1295,11 +1295,51 @@ InvalidState AXNodeObject::invalidState() const
     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;
     }
 
@@ -1312,6 +1352,9 @@ int AXNodeObject::setSize() const
         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();