Print Preview: Support the duplex preset in PDFs.

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 
 #include <map>
 #include <vector>
 
 #include "base/id_map.h"
@@ skipping 614 matching lines @@
 void PrintPreviewUI::OnReloadPrintersList() {
   web_ui()->CallJavascriptFunction("reloadPrintersList");
 }
 
 void PrintPreviewUI::OnSetOptionsFromDocument(
     const PrintHostMsg_SetOptionsFromDocument_Params& params) {
   base::DictionaryValue options;
   options.SetBoolean(printing::kSettingDisableScaling,
                      params.is_scaling_disabled);
   options.SetInteger(printing::kSettingCopies, params.copies);
+  options.SetInteger(printing::kSettingDuplexMode, params.duplex);
   web_ui()->CallJavascriptFunction("printPresetOptionsFromDocument", options);
 }
 
 // static
 void PrintPreviewUI::SetDelegateForTesting(TestingDelegate* delegate) {
   g_testing_delegate = delegate;
 }
 
 void PrintPreviewUI::SetSelectedFileForTesting(const base::FilePath& path) {
   handler_->FileSelected(path, 0, NULL);
 }
 
 void PrintPreviewUI::SetPdfSavedClosureForTesting(
     const base::Closure& closure) {
   handler_->SetPdfSavedClosureForTesting(closure);
 }