[Persistence] Show user, modification time

Show user name and modification time in dialog when revision-checking
detects modifications. WTD-1033.

platform/persistence/queue/src/PersistenceFailureConstants.js

@@ -2,5 +2,7 @@
 
 define({
     REVISION_ERROR_KEY: "revision",
-    OVERWRITE_KEY: "overwrite"
+    OVERWRITE_KEY: "overwrite",
+    TIMESTAMP_FORMAT: "YYYY-MM-DD HH:mm:ss\\Z",
+    UNKNOWN_USER: "unknown user"
 });

platform/persistence/queue/src/PersistenceFailureController.js

@@ -0,0 +1,32 @@
+/*global define*/
+
+define(
+    ['moment', './PersistenceFailureConstants'],
+    function (moment, Constants) {
+        "use strict";
+
+        /**
+         * Controller to support the template to be shown in the
+         * dialog shown for persistence failures.
+         */
+        function PersistenceFailureController() {
+            return {
+                /**
+                 * Format a timestamp for display in the dialog.
+                 */
+                formatTimestamp: function (timestamp) {
+                    return moment.utc(timestamp)
+                        .format(Constants.TIMESTAMP_FORMAT);
+                },
+                /**
+                 * Format a user name for display in the dialog.
+                 */
+                formatUsername: function (username) {
+                    return username || Constants.UNKNOWN_USER;
+                }
+            };
+        }
+
+        return PersistenceFailureController;
+    }
+);