AX: Make the calendar role "grid".

LayoutTests/fast/forms/resources/picker-common.js

 window.jsTestIsAsync = true;
 if (window.internals)
     internals.setEnableMockPagePopup(true);
 
 var popupWindow = null;
 
 var popupOpenCallback = null;
 function openPicker(input, callback) {
     input.offsetTop; // Force to lay out
     if (input.type === "color") {
         input.focus();
         eventSender.keyDown(" ");
     } else {
         sendKey(input, "Down", false, true);
     }
     popupWindow = document.getElementById('mock-page-popup').contentWindow;
     if (typeof callback === "function") {
         popupOpenCallback = callback;
         popupWindow.addEventListener("didOpenPicker", popupOpenCallbackWrapper, false);
     }
 }
 
 function popupOpenCallbackWrapper() {
     popupWindow.removeEventListener("didOpenPicker", popupOpenCallbackWrapper);
-    popupOpenCallback();
+    setTimeout(popupOpenCallback, 0);
 }
 
 function waitUntilClosing(callback) {
     setTimeout(callback, 1);
 }
 
 function sendKey(input, keyName, ctrlKey, altKey) {
     var event = document.createEvent('KeyboardEvent');
     event.initKeyboardEvent('keydown', true, true, document.defaultView, keyName, 0, ctrlKey, altKey);
     input.dispatchEvent(event);
 }