update elements and fix some bugs

lib/src/iron-overlay-behavior/test/iron-overlay-behavior.html

Index: lib/src/iron-overlay-behavior/test/iron-overlay-behavior.html
diff --git a/lib/src/iron-overlay-behavior/test/iron-overlay-behavior.html b/lib/src/iron-overlay-behavior/test/iron-overlay-behavior.html
index f821e5589945a7f8b31a3bac0ed4c2128e38773f..a352a4b18948fc2116b9978176cbd9339f7bfefa 100644
--- a/lib/src/iron-overlay-behavior/test/iron-overlay-behavior.html
+++ b/lib/src/iron-overlay-behavior/test/iron-overlay-behavior.html
@@ -86,7 +86,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
       function runAfterOpen(overlay, cb) {
         overlay.addEventListener('iron-overlay-opened', function() {
-          cb();
+          Polymer.Base.async(cb, 1);
         });
         overlay.open();
       }
@@ -181,6 +181,15 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
         test('cancel an overlay by clicking outside', function(done) {
           runAfterOpen(overlay, function() {
+            overlay.addEventListener('iron-overlay-canceled', function(event) {
+              done();
+            });
+            Polymer.Base.fire.call(document, 'click');
+          });
+        });
+
+        test('close an overlay by clicking outside', function(done) {
+          runAfterOpen(overlay, function() {
             overlay.addEventListener('iron-overlay-closed', function(event) {
               assert.isTrue(event.detail.canceled, 'overlay is canceled');
               done();
@@ -189,8 +198,36 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
           });
         });
 
+        test('cancel event can be prevented', function(done) {
+          runAfterOpen(overlay, function() {
+            overlay.addEventListener('iron-overlay-canceled', function(event) {
+              event.preventDefault();
+            });
+            var closedListener = function(event) {
+              throw new Error('iron-overlay-closed should not fire');
+            };
+            overlay.addEventListener('iron-overlay-closed', closedListener);
+            Polymer.Base.fire.call(document, 'click');
+            setTimeout(function() {
+              overlay.removeEventListener('iron-overlay-closed', closedListener);
+              done();
+            }, 10);
+          });
+        });
+
         test('cancel an overlay with esc key', function(done) {
           runAfterOpen(overlay, function() {
+            overlay.addEventListener('iron-overlay-canceled', function(event) {
+              done();
+            });
+            fireEvent('keydown', {
+              keyCode: 27
+            }, document);
+          });
+        });
+
+        test('close an overlay with esc key', function(done) {
+          runAfterOpen(overlay, function() {
             overlay.addEventListener('iron-overlay-closed', function(event) {
               assert.isTrue(event.detail.canceled, 'overlay is canceled');
               done();