Implement AccessibleNode.hasPopUp for Accessibility Object Model phase 1

third_party/WebKit/LayoutTests/accessibility/aom-string-properties.html

Index: third_party/WebKit/LayoutTests/accessibility/aom-string-properties.html
diff --git a/third_party/WebKit/LayoutTests/accessibility/aom-string-properties.html b/third_party/WebKit/LayoutTests/accessibility/aom-string-properties.html
index 58524ee13d9f73189977ca835a2ad82e93823074..10b934647df20a008bba77d30dc848b3200bd01f 100644
--- a/third_party/WebKit/LayoutTests/accessibility/aom-string-properties.html
+++ b/third_party/WebKit/LayoutTests/accessibility/aom-string-properties.html
@@ -61,6 +61,20 @@ test(function(t) {
 }, "AccessibleNode.current");
 </script>
 
+<div role="textbox" id="hasPopUp"></div>
+
+<script>
+test(function(t) {
+    var node = document.getElementById("hasPopUp");
+    var axNode = accessibilityController.accessibleElementById("hasPopUp");
+    assert_equals(axNode.hasPopup, false);
+    node.accessibleNode.hasPopUp = true;
+    assert_equals(axNode.hasPopup, true);
+    // TODO(dmazzoni): Test support for ARIA 1.1 values like "dialog", "tree", etc.
+    // when those are mapped through to platform APIs.
+}, "AccessibleNode.hasPopUp");
+</script>
+
 <div role="textbox" id="invalid"></div>
 
 <script>