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

printing/print_job_constants.h

 // 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.
 
 #ifndef PRINTING_PRINT_JOB_CONSTANTS_H_
 #define PRINTING_PRINT_JOB_CONSTANTS_H_
 
 namespace printing {
 
 extern const char kIsFirstRequest[];
 extern const char kPreviewRequestID[];
 extern const char kPreviewUIAddr[];
+extern const char kPrinterDefaultDuplexValue[];
 extern const char kSettingCloudPrintId[];
 extern const char kSettingCollate[];
 extern const char kSettingColor[];
 extern const char kSettingContentHeight[];
 extern const char kSettingContentWidth[];
 extern const char kSettingCopies[];
 extern const char kSettingDefaultMarginsSelected[];
 extern const char kSettingDeviceName[];
-extern const char kSettingDuplexMode[];
+extern const char kSettingDuplexModeInfo[];
 extern const char kSettingGenerateDraftData[];
 extern const char kSettingHeaderFooterEnabled[];
 extern const int kSettingHeaderFooterCharacterSpacing;
 extern const char kSettingHeaderFooterFontFamilyName[];
 extern const char kSettingHeaderFooterFontName[];
 extern const int kSettingHeaderFooterFontSize;
 extern const float kSettingHeaderFooterHorizontalRegions;
 extern const float kSettingHeaderFooterInterstice;
 extern const char kSettingHeaderFooterDate[];
 extern const char kSettingHeaderFooterTitle[];
 extern const char kSettingHeaderFooterURL[];
 extern const char kSettingLandscape[];
 extern const char kSettingMarginBottom[];
 extern const char kSettingMarginLeft[];
 extern const char kSettingMarginRight[];
 extern const char kSettingMarginTop[];
 extern const char kSettingMargins[];
 extern const char kSettingPageRange[];
 extern const char kSettingPageRangeFrom[];
 extern const char kSettingPageRangeTo[];
 extern const char kSettingPrinterName[];
 extern const char kSettingPrintToPDF[];
+extern const char kUserSelectedDuplexValue[];
 
 extern const int FIRST_PAGE_INDEX;
 extern const int COMPLETE_PREVIEW_DOCUMENT_INDEX;
 
 // Print job duplex mode values.
 enum DuplexMode {
   SIMPLEX,
   LONG_EDGE,
   SHORT_EDGE,
 };
 
+// Specifies the possible default duplex setting values.
+enum DefaultDuplexSetting {
+  UNKNOWN = -1,
+  ONE_SIDED,
+  TWO_SIDED,
+};
+
 // Specifies the horizontal alignment of the headers and footers.
 enum HorizontalHeaderFooterPosition {
   LEFT,
   CENTER,
   RIGHT
 };
 
 // Specifies the vertical alignment of the Headers and Footers.
 enum VerticalHeaderFooterPosition {
   TOP,
   BOTTOM
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINT_JOB_CONSTANTS_H_