Adds option to enable CSS backgrounds for printing.

printing/print_job_constants.h

 // 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.
 
 #ifndef PRINTING_PRINT_JOB_CONSTANTS_H_
 #define PRINTING_PRINT_JOB_CONSTANTS_H_
 
 #include "build/build_config.h"
 #include "printing/printing_export.h"
 
@@ skipping 29 matching lines @@
 PRINTING_EXPORT extern const char kSettingPageRange[];
 PRINTING_EXPORT extern const char kSettingPageRangeFrom[];
 PRINTING_EXPORT extern const char kSettingPageRangeTo[];
 PRINTING_EXPORT extern const char kSettingPreviewModifiable[];
 PRINTING_EXPORT extern const char kSettingPrintableAreaX[];
 PRINTING_EXPORT extern const char kSettingPrintableAreaY[];
 PRINTING_EXPORT extern const char kSettingPrintableAreaWidth[];
 PRINTING_EXPORT extern const char kSettingPrintableAreaHeight[];
 PRINTING_EXPORT extern const char kSettingPrinterName[];
 PRINTING_EXPORT extern const char kSettingPrintToPDF[];
+PRINTING_EXPORT extern const char kSettingShouldPrintBackgrounds[];
 
 PRINTING_EXPORT extern const int FIRST_PAGE_INDEX;
 PRINTING_EXPORT extern const int COMPLETE_PREVIEW_DOCUMENT_INDEX;
 
 #if defined(OS_MACOSX)
 PRINTING_EXPORT extern const char kSettingOpenPDFInPreview[];
 #endif  // defined(OS_MACOSX)
 
 #if defined (USE_CUPS)
 // Printer color models
@@ skipping 64 matching lines @@
 enum MarginType {
   DEFAULT_MARGINS,  // Default varies depending on headers being enabled or not
   NO_MARGINS,
   PRINTABLE_AREA_MARGINS,
   CUSTOM_MARGINS,
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINT_JOB_CONSTANTS_H_