AXMenuListOption should respect role attribute.

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

Index: third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
index 79b691f1f1450eaeb933717b28af9b6846cd699a..f8b18a716f713697c9a8bce941f6c15ddedd977b 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
@@ -49,6 +49,18 @@ void AXMenuListOption::detach()
     AXMockObject::detach();
 }
 
+AccessibilityRole AXMenuListOption::roleValue() const
+{
+    const AtomicString& ariaRole = getAttribute(roleAttr);
+    if (ariaRole.isEmpty())
+        return MenuListOptionRole;
+
+    AccessibilityRole role = ariaRoleToWebCoreRole(ariaRole);
+    if (role)
+        return role;
+    return MenuListOptionRole;
+}
+
 Element* AXMenuListOption::actionElement() const
 {
     return m_element;