Re-land: Don't keep recreating AXMenuListPopup

LayoutTests/accessibility/menu-list-popup-reuses-objects.html

Index: LayoutTests/accessibility/menu-list-popup-reuses-objects.html
diff --git a/LayoutTests/accessibility/menu-list-selection-changed.html b/LayoutTests/accessibility/menu-list-popup-reuses-objects.html
similarity index 57%
copy from LayoutTests/accessibility/menu-list-selection-changed.html
copy to LayoutTests/accessibility/menu-list-popup-reuses-objects.html
index b584cee986add87c1fd8f770efde04ecca03db98..4c0d31e87594d41511a83d934e9f76e7b57640c1 100644
--- a/LayoutTests/accessibility/menu-list-selection-changed.html
+++ b/LayoutTests/accessibility/menu-list-popup-reuses-objects.html
@@ -20,20 +20,29 @@ if (window.testRunner && window.accessibilityController) {
     var menulist = document.getElementById("menulist");
     menulist.selectedIndex = 0;
 
+    var axMenuList = accessibilityController.accessibleElementById("menulist");
+    var axMenuListPopup = axMenuList.childAtIndex(0);
+    shouldBe("axMenuListPopup.role", "\"AXRole: AXMenuListPopup\"");
+    var axMenuListOption = axMenuListPopup.childAtIndex(0);
+    shouldBe("axMenuListOption.role", "\"AXRole: AXMenuListOption\"");
+
+    window.setTimeout(function() {
+
     // Explore the whole accessibility tree. State change events won't fire on accessible objects that haven't
     // been created yet.
     accessibilityController.accessibleElementById('foo');
 
-    var result = "";
     accessibilityController.addNotificationListener(function(element, notification) {
-        if (element.role == "AXRole: AXMenuListOption") {
-            debug("Got notification on option " + element.stringValue + " isSelected=" + element.isSelected);
-            if (element.isSelected)
-                finishJSTest();
+        if (element.stringValue == axMenuListOption.stringValue) {
+            window.element = element;
+            shouldBe("element.isEqual(axMenuListOption)", "true");
+            shouldBe("element.parentElement().isEqual(axMenuListPopup)", "true");
+            finishJSTest();
         }
     });
 
-    menulist.selectedIndex = 2;
+    menulist.selectedIndex = 1;
+    }, 0);
 }
 
 </script>