Begins preview generation as soon as initial state is loaded. Doesn't wait for print destination to…

chrome/browser/resources/print_preview/preview_generator.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';
 
   /**
    * Interface to the Chromium print preview generator.
    * @param {!print_preview.DestinationStore} destinationStore Used to get the
@@ skipping 136 matching lines @@
   PreviewGenerator.prototype = {
     __proto__: cr.EventTarget.prototype,
 
     /**
      * Request that new preview be generated. A preview request will not be
      * generated if the print ticket has not changed sufficiently.
      * @return {boolean} Whether a new preview was actually requested.
      */
     requestPreview: function() {
       if (!this.printTicketStore_.isTicketValidForPreview() ||
-          !this.destinationStore_.selectedDestination ||
           !this.printTicketStore_.isInitialized) {
         return false;
       }
       if (!this.hasPreviewChanged_()) {
         // Changes to these ticket items might not trigger a new preview, but
         // they still need to be recorded.
         this.marginsType_ = this.printTicketStore_.getMarginsType();
         return false;
       }
       this.isLandscapeEnabled_ = this.printTicketStore_.isLandscapeEnabled();
@@ skipping 239 matching lines @@
       // current one.
       cr.dispatchSimpleEvent(this, PreviewGenerator.EventType.FAIL);
     }
   };
 
   // Export
   return {
     PreviewGenerator: PreviewGenerator
   };
 });