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

third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp

Index: third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
diff --git a/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp b/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
index a09c6707046e34edadc476c3c5790a4a56f06f03..c60402ae16ec7684cbee795cec2d332b544be582 100644
--- a/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
+++ b/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
@@ -38,6 +38,7 @@ public:
     void requiredAttributeChanged(HTMLInputElement*);
     void remove(HTMLInputElement*);
     bool contains(HTMLInputElement*) const;
+    unsigned size() const;
 
     DECLARE_TRACE();
 
@@ -180,6 +181,13 @@ void RadioButtonGroup::remove(HTMLInputElement* button)
         // valid only if the group was invalid.
         button->setNeedsValidityCheck();
     }
+
+    // Send notification to update AX attributes for AXObjects which radiobutton group has.
+    if (!m_members.isEmpty()) {
+        HTMLInputElement* input = m_members.begin()->key;
+        if (AXObjectCache* cache = input->document().existingAXObjectCache())
+            cache->radiobuttonRemovedFromGroup(input);
+    }
 }
 
 void RadioButtonGroup::setNeedsValidityCheckForAllButtons()
@@ -196,6 +204,11 @@ bool RadioButtonGroup::contains(HTMLInputElement* button) const
     return m_members.contains(button);
 }
 
+unsigned RadioButtonGroup::size() const
+{
+    return m_members.size();
+}
+
 DEFINE_TRACE(RadioButtonGroup)
 {
 #if ENABLE(OILPAN)
@@ -277,6 +290,17 @@ bool RadioButtonGroupScope::isInRequiredGroup(HTMLInputElement* element) const
     return group && group->isRequired() && group->contains(element);
 }
 
+unsigned RadioButtonGroupScope::groupSizeFor(const HTMLInputElement* element) const
+{
+    if (!m_nameToGroupMap)
+        return 0;
+
+    RadioButtonGroup* group = m_nameToGroupMap->get(element->name());
+    if (!group)
+        return 0;
+    return group->size();
+}
+
 void RadioButtonGroupScope::removeButton(HTMLInputElement* element)
 {
     ASSERT(element->type() == InputTypeNames::radio);