PrintPreview: Added code to identify the printer default duplex value.

chrome/browser/resources/print_preview/print_preview.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.
 
 // require: cr/ui/print_preview_cloud.js
 
 var localStrings = new LocalStrings();
 
 // If useCloudPrint is true we attempt to connect to cloud print
 // and populate the list of printers with cloud print printers.
@@ skipping 221 matching lines @@
     skip_refresh = true;
   } else if (selectedValue == MORE_PRINTERS) {
     onSystemDialogLinkClicked();
     skip_refresh = true;
   } else if (selectedValue == PRINT_TO_PDF) {
     updateWithPrinterCapabilities({
         'disableColorOption': true,
         'setColorAsDefault': true,
         'setDuplexAsDefault': false,
         'printerColorModelForColor': colorSettings.COLOR,
+        'printerDefaultDuplexValue': copiesSettings.UNKNOWN_DUPLEX_MODE,
         'disableCopiesOption': true});
   } else {
     // This message will call back to 'updateWithPrinterCapabilities'
     // function.
     chrome.send('getPrinterCapabilities', [selectedValue]);
   }
   if (!skip_refresh) {
     lastSelectedPrinterIndex = selectedIndex;
 
     // Regenerate the preview data based on selected printer settings.
@@ skipping 849 matching lines @@
 <include src="print_preview_animations.js"/>
 <include src="print_preview_cloud.js"/>
 <include src="print_preview_utils.js"/>
 <include src="print_header.js"/>
 <include src="page_settings.js"/>
 <include src="copies_settings.js"/>
 <include src="header_footer_settings.js"/>
 <include src="layout_settings.js"/>
 <include src="color_settings.js"/>
 <include src="margin_settings.js"/>