Add the vibrate attribute to the Notification object

LayoutTests/http/tests/notifications/notification-properties.html

Index: LayoutTests/http/tests/notifications/notification-properties.html
diff --git a/LayoutTests/http/tests/notifications/notification-properties.html b/LayoutTests/http/tests/notifications/notification-properties.html
index a70e818510478fc4a550c742f9e47697a210b247..8560aeb85eed4cf6feffdf972edb63e0f5904982 100644
--- a/LayoutTests/http/tests/notifications/notification-properties.html
+++ b/LayoutTests/http/tests/notifications/notification-properties.html
@@ -66,6 +66,34 @@
             // Setting an empty string as the tag should be equal to not setting the tag at all.
             assert_equals(noTagNotification.tag, emptyTagNotification.tag);
 
+            var vibrateNotification = new Notification("My Notification", {
+                vibrate: 1000
+            });
+
+            // vibrate pattern should be returned in serialized form.
+            assert_equals(1000, vibrateNotification.vibrate);
+
+            // Tests that it must be a valid vibration sequence.
+            var pattern = new Array(100, 200, 300);
+            var sequenceVibrateNotification = new Notification("My Notification", {
+                vibrate: pattern
+            });
+            assert_array_equals(pattern, sequenceVibrateNotification.vibrate);
+
+            // Invalid vibrate pattern should be reset to 0.
+            var invalidVibrateNotification = new Notification("My Notification", {
+                vibrate: [100, 200, "invalid"]
+            });
+            assert_array_equals([100, 200, 0], invalidVibrateNotification.vibrate);
+
+            // Verifying the exception throwing behavior, when slient set true and vibrate is presented.
+            assert_throws(new TypeError(), function() {
+                var notification = new Notification("My Notification", {
+                    silent: true,
+                    vibrate: 1000
+                });
+            }, 'Set vibrate, when slient is true.');
+
       }, 'Checks the properties exposed on the Notification object.');
     </script>
   </body>