Improves application state persistance.

chrome/browser/resources/print_preview/metrics.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Object used to measure usage statistics.
    * @constructor
@@ skipping 17 matching lines @@
     // Used when the user chooses to sign-in to their Google account.
     SIGNIN_TRIGGERED: 4
   };
 
   Metrics.prototype = {
     /**
      * Increments the counter for a given bucket.
      * @param {!print_preview.Metrics.Bucket} bucket Bucket to increment.
      */
     increment: function(bucket) {
-      chrome.send('reportDestinationEvent', bucket);
+      chrome.send('reportDestinationEvent', [bucket]);
     }
   };
 
   // Export
   return {
     Metrics: Metrics
   };
 });