Guard against undefined average in stats display.

remoting/webapp/base/js/connection_stats.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.
 
 /**
  * @fileoverview
  * Module to support debug overlay window with connection stats.
  */
 
 'use strict';
@@ skipping 123 matching lines @@
     }
   }
 
   /**
    * @param {string} type
    * @param {number} avg
    * @param {number} max
    * @return {string} "type: avg, max; " e.g. "RTT: 8.0, 13; "
    */
   function formatStat(type, avg, max) {
-    return type + ': ' + avg.toFixed(1) + ', ' + max + '; ';
+    var avgStr = (avg == undefined) ? 'n/a' : avg.toFixed(1);
+    return type + ': ' + avgStr + ', ' + max + '; ';
   }
 
   var statistics = document.getElementById('statistics');
   this.statsElement_.innerText = (
       '(avg, max in ms) ' +
       formatStat('Capture', stats.captureLatency, stats.maxCaptureLatency) +
       formatStat('Encode', stats.encodeLatency, stats.maxEncodeLatency) +
       formatStat('Decode', stats.decodeLatency, stats.maxDecodeLatency) +
       formatStat('Render', stats.renderLatency, stats.maxRenderLatency) +
       formatStat('RTT', stats.roundtripLatency, stats.maxRoundtripLatency) +
       'Bandwidth: ' + formatStatNumber(videoBandwidth, units, 2) + '; ' +
       'Frame Rate: ' + formatStatNumber(stats.videoFrameRate, 'fps', 1)
     );
 };