Fix jscompiler error.

remoting/webapp/remoting.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @type {remoting.HostSession} */ remoting.hostSession = null;
@@ skipping 287 matching lines @@
 }
 
 /**
  * Return the current time as a formatted string suitable for logging.
  *
  * @return {string} The current time, formatted as [mmdd/hhmmss.xyz]
 */
 remoting.timestamp = function() {
   /**
    * @param {number} num A number.
-   * @return {string} The number, formatted as a string of the specified length.
+   * @param {number} len The required length of the answer.
+   * @return {string} The number, formatted as a string of the specified length
+   *     by prepending zeroes as necessary.
    */
   var pad = function(num, len) {
     var result = num.toString();
     if (result.length < len) {
       result = new Array(len - result.length + 1).join('0') + result;
     }
     return result;
   };
   var now = new Date();
   var timestamp = pad(now.getMonth() + 1, 2) + pad(now.getDate(), 2) + '/' +
       pad(now.getHours(), 2) + pad(now.getMinutes(), 2) +
       pad(now.getSeconds(), 2) + '.' + pad(now.getMilliseconds(), 3);
   return '[' + timestamp + ']';
 };