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

printing/printing_context_mac.mm

 // 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.
 
 #include "printing/printing_context_mac.h"
 
 #import <ApplicationServices/ApplicationServices.h>
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
@@ skipping 93 matching lines @@
 
   // NOTE: Reset |print_info_| with a copy of |sharedPrintInfo| so as to start
   // with a clean slate.
   print_info_.reset([[NSPrintInfo sharedPrintInfo] copy]);
 
   bool collate;
   bool color;
   bool landscape;
   bool print_to_pdf;
   int copies;
-  int duplex_mode;
+  DictionaryValue* duplex_info;
+  int user_selected_duplex_value;
   std::string device_name;
 
   if (!job_settings.GetBoolean(kSettingLandscape, &landscape) ||
       !job_settings.GetBoolean(kSettingCollate, &collate) ||
       !job_settings.GetBoolean(kSettingColor, &color) ||
       !job_settings.GetBoolean(kSettingPrintToPDF, &print_to_pdf) ||
-      !job_settings.GetInteger(kSettingDuplexMode, &duplex_mode) ||
+      !job_settings.GetDictionary(kSettingDuplexModeInfo, &duplex_info) ||
+      !duplex_info->GetInteger(kUserSelectedDuplexValue,
+                               &user_selected_duplex_value) ||
       !job_settings.GetInteger(kSettingCopies, &copies) ||
       !job_settings.GetString(kSettingDeviceName, &device_name)) {
     return OnError();
   }
 
   bool print_to_cloud = job_settings.HasKey(printing::kSettingCloudPrintId);
 
   if (!print_to_pdf && !print_to_cloud) {
     if (!SetPrinter(device_name))
       return OnError();
 
     if (!SetCopiesInPrintSettings(copies))
       return OnError();
 
     if (!SetCollateInPrintSettings(collate))
       return OnError();
 
     if (!SetDuplexModeInPrintSettings(
-            static_cast<DuplexMode>(duplex_mode))) {
+            static_cast<DuplexMode>(user_selected_duplex_value))) {
       return OnError();
     }
 
     if (!SetOutputIsColor(color))
       return OnError();
   }
 
   if (!SetOrientationIsLandscape(landscape))
     return OnError();
 
@@ skipping 219 matching lines @@
 void PrintingContextMac::ReleaseContext() {
   print_info_.reset();
   context_ = NULL;
 }
 
 gfx::NativeDrawingContext PrintingContextMac::context() const {
   return context_;
 }
 
 }  // namespace printing