Print Preview: Support the duplex preset in PDFs.

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
 
 <include src="component.js">
 <include src="print_preview_focus_manager.js">
 
 cr.define('print_preview', function() {
@@ skipping 978 matching lines @@
       if (event.optionsFromDocument.disableScaling) {
         this.printTicketStore_.fitToPage.updateValue(null);
         this.documentInfo_.updateIsScalingDisabled(true);
       }
 
       if (event.optionsFromDocument.copies > 0 &&
           this.printTicketStore_.copies.isCapabilityAvailable()) {
         this.printTicketStore_.copies.updateValue(
             event.optionsFromDocument.copies);
       }
+
+      if (event.optionsFromDocument.duplex >= 0 &&
+          this.printTicketStore_.duplex.isCapabilityAvailable()) {
+        this.printTicketStore_.duplex.updateValue(
+            event.optionsFromDocument.duplex);
+      }
     },
 
     /**
      * Called when privet printing fails.
      * @param {Event} event Event object representing the failure.
      * @private
      */
     onPrivetPrintFailed_: function(event) {
       console.error('Privet printing failed with error code ' +
                     event.httpError);
@@ skipping 300 matching lines @@
 <include src="search/cloud_destination_list.js">
 <include src="search/recent_destination_list.js">
 <include src="search/destination_list_item.js">
 <include src="search/destination_search.js">
 <include src="search/fedex_tos.js">
 
 window.addEventListener('DOMContentLoaded', function() {
   printPreview = new print_preview.PrintPreview();
   printPreview.initialize();
 });