In kiosk printing mode, start printing when destination is ready.

chrome/browser/resources/print_preview/print_preview.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.
 
 // TODO(rltoscano): Move data/* into print_preview.data namespace
 
 var localStrings = new LocalStrings(templateData);
 
 <include src="component.js"/>
 
@@ skipping 866 matching lines @@
 
     /**
      * Called when a print destination is selected. Shows/hides the "Print with
      * Cloud Print" link in the navbar.
      * @private
      */
     onDestinationSelect_: function() {
       var selectedDest = this.destinationStore_.selectedDestination;
       setIsVisible($('cloud-print-dialog-link'),
                    !cr.isChromeOS && !selectedDest.isLocal);
+      if (this.isInKioskAutoPrintMode_) {
+        this.onPrintButtonClick_();
+      }
     },
 
     /**
      * Called when the destination store loads a group of destinations. Shows
      * a promo on Chrome OS if the user has no print destinations promoting
      * Google Cloud Print.
      * @private
      */
     onDestinationSearchDone_: function() {
       var isPromoVisible = cr.isChromeOS &&
@@ skipping 101 matching lines @@
 <include src="search/recent_destination_list.js"/>
 <include src="search/destination_list_item.js"/>
 <include src="search/destination_search.js"/>
 <include src="search/search_box.js"/>
 <include src="search/fedex_tos.js"/>
 
 window.addEventListener('DOMContentLoaded', function() {
   printPreview = new print_preview.PrintPreview();
   printPreview.initialize();
 });