Initialize remoting.ClientSession.PerfStats with zeros

remoting/webapp/base/js/stats_accumulator.js

 // Copyright (c) 2011 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
  * The webapp reads the plugin's connection statistics frequently (once per
  * second). It logs statistics to the server less frequently, to keep
  * bandwidth and storage costs down. This class bridges that gap, by
  * accumulating high-frequency numeric data, and providing statistics
  * summarising that data.
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
+(function() {
+
 /**
  * @constructor
  */
 remoting.StatsAccumulator = function() {
   /**
    * A map from names to lists of values.
    * @private {Object<Array<number>>}
    */
   this.valueLists_ = {};
 
   /**
    * The first time, after this object was most recently initialized or emptied,
    * at which a value was added to this object.
    * @private {?number}
    */
   this.timeOfFirstValue_ = null;
 };
 
 /**
- * Adds values to this object.
+ * @param {Object<number>} stats
+ * @return {boolean} true if there is any non-zero value in stats, false
+ *     otherwise.
+ */
+function hasValidField(stats) {
+  for (var key in stats) {
+    if (stats[key] !== 0) {
+      return true;
+    }
+  }
+  return false;
+}
+
+/**
+ * Adds values to this object. Do nothing if newValues has no valid field.
  *
  * @param {Object<number>} newValues
  */
 remoting.StatsAccumulator.prototype.add = function(newValues) {
+  if (!hasValidField(newValues)) {
+    return;
+  }
   for (var key in newValues) {
     this.getValueList(key).push(newValues[key]);
   }
   if (this.timeOfFirstValue_ === null) {
     this.timeOfFirstValue_ = new Date().getTime();
   }
 };
 
 /**
  * Empties this object.
@@ skipping 101 matching lines @@
   stats.maxCaptureLatency = this.calcMax('maxCaptureLatency');
   stats.encodeLatency = this.calcMean('encodeLatency');
   stats.maxEncodeLatency = this.calcMax('maxEncodeLatency');
   stats.decodeLatency = this.calcMean('decodeLatency');
   stats.maxDecodeLatency = this.calcMax('maxDecodeLatency');
   stats.renderLatency = this.calcMean('renderLatency');
   stats.maxRenderLatency = this.calcMax('maxRenderLatency');
   stats.roundtripLatency = this.calcMean('roundtripLatency');
   stats.maxRoundtripLatency = this.calcMax('maxRoundtripLatency');
 
-  for (var key in stats) {
-    if (stats[key] !== 0) {
-      return stats;
-    }
-  }
-  return null;
-};
+  return hasValidField(stats) ? stats : null;
+};
+
+})();