Change print setting conventions for margins to support more options.

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_
 
 #include "printing/printing_export.h"
 
 namespace printing {
 
 PRINTING_EXPORT extern const char kIsFirstRequest[];
 PRINTING_EXPORT extern const char kPreviewRequestID[];
 PRINTING_EXPORT extern const char kPreviewUIAddr[];
 PRINTING_EXPORT extern const char kSettingCloudPrintId[];
 PRINTING_EXPORT extern const char kSettingCloudPrintDialog[];
 PRINTING_EXPORT extern const char kSettingCollate[];
 PRINTING_EXPORT extern const char kSettingColor[];
 PRINTING_EXPORT extern const char kSettingContentHeight[];
 PRINTING_EXPORT extern const char kSettingContentWidth[];
 PRINTING_EXPORT extern const char kSettingCopies[];
-PRINTING_EXPORT extern const char kSettingDefaultMarginsSelected[];
 PRINTING_EXPORT extern const char kSettingDeviceName[];
 PRINTING_EXPORT extern const char kSettingDuplexMode[];
 PRINTING_EXPORT extern const char kSettingGenerateDraftData[];
 PRINTING_EXPORT extern const char kSettingHeaderFooterEnabled[];
 PRINTING_EXPORT extern const int kSettingHeaderFooterCharacterSpacing;
 PRINTING_EXPORT extern const char kSettingHeaderFooterFontFamilyName[];
 PRINTING_EXPORT extern const char kSettingHeaderFooterFontName[];
 PRINTING_EXPORT extern const int kSettingHeaderFooterFontSize;
 PRINTING_EXPORT extern const float kSettingHeaderFooterHorizontalRegions;
 PRINTING_EXPORT extern const float kSettingHeaderFooterInterstice;
 PRINTING_EXPORT extern const char kSettingHeaderFooterDate[];
 PRINTING_EXPORT extern const char kSettingHeaderFooterTitle[];
 PRINTING_EXPORT extern const char kSettingHeaderFooterURL[];
 PRINTING_EXPORT extern const char kSettingLandscape[];
 PRINTING_EXPORT extern const char kSettingMarginBottom[];
 PRINTING_EXPORT extern const char kSettingMarginLeft[];
 PRINTING_EXPORT extern const char kSettingMarginRight[];
 PRINTING_EXPORT extern const char kSettingMarginTop[];
-PRINTING_EXPORT extern const char kSettingMargins[];
+PRINTING_EXPORT extern const char kSettingMarginsCustom[];
+PRINTING_EXPORT extern const char kSettingMarginsType[];
 PRINTING_EXPORT extern const char kSettingPageRange[];
 PRINTING_EXPORT extern const char kSettingPageRangeFrom[];
 PRINTING_EXPORT extern const char kSettingPageRangeTo[];
 PRINTING_EXPORT extern const char kSettingPrinterName[];
 PRINTING_EXPORT extern const char kSettingPrintToPDF[];
 
 PRINTING_EXPORT extern const int FIRST_PAGE_INDEX;
 PRINTING_EXPORT extern const int COMPLETE_PREVIEW_DOCUMENT_INDEX;
 
 // Print job duplex mode values.
@@ skipping 17 matching lines @@
   BOTTOM
 };
 
 // Print job color mode values.
 enum ColorMode {
   GRAY = 1,
   COLOR,
   CMYK,
 };
 
+// What kind of margins to use.
+enum MarginType {
+  DEFAULT_MARGINS,  // Default varies depending on headers being enabled or not
+  NO_MARGINS,
+  CUSTOM_MARGINS,
+  PRINTABLE_AREA_MARGINS,
+};
+
 }  // namespace printing
 
 #endif  // PRINTING_PRINT_JOB_CONSTANTS_H_