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

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

Index: third_party/WebKit/Source/modules/accessibility/AXRadioInput.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXRadioInput.cpp b/third_party/WebKit/Source/modules/accessibility/AXRadioInput.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9ccc4bebaaed2f152bb3e7fc21f0c2a0d915d706
--- /dev/null
+++ b/third_party/WebKit/Source/modules/accessibility/AXRadioInput.cpp
@@ -0,0 +1,58 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+#include "modules/accessibility/AXRadioInput.h"
+
+#include "core/html/HTMLInputElement.h"
+#include "modules/accessibility/AXObjectCacheImpl.h"
+
+namespace blink {
+
+using namespace HTMLNames;
+
+AXRadioInput::AXRadioInput(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
+    : AXLayoutObject(layoutObject, axObjectCache)
+    , m_posInSet(1)
+{
+    element()->setNeedToUpdateAXPosition(true);
+}
+
+AXRadioInput* AXRadioInput::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
+{
+    return new AXRadioInput(layoutObject, axObjectCache);
+}
+
+int AXRadioInput::posInSet() const
+{
+    if (hasAttribute(aria_posinsetAttr))
+        return getAttribute(aria_posinsetAttr).toInt();
+
+    element()->updateAXPositionInRadioGroup();
+    return m_posInSet;
+}
+
+int AXRadioInput::setSize() const
+{
+    if (hasAttribute(aria_setsizeAttr))
+        return getAttribute(aria_setsizeAttr).toInt();
+
+    return sizeOfRadioGroup();
+}
+
+HTMLInputElement* AXRadioInput::element() const
+{
+    return toHTMLInputElement(m_layoutObject->node());
+}
+
+int AXRadioInput::sizeOfRadioGroup() const
+{
+    int size = element()->sizeOfRadioGroup();
+    // If it has no size in Group, it means that there is only itself.
+    if (!size)
+        return 1;
+    return size;
+}
+
+} // namespace blink