Print directly to CUPS using the IPP APIs

printing/backend/cups_ipp_util.h

 // Copyright 2016 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_BACKEND_CUPS_IPP_UTIL_H_
 #define PRINTING_BACKEND_CUPS_IPP_UTIL_H_
 
 #include <vector>
 
 #include "base/strings/string_piece.h"
 #include "printing/backend/cups_printer.h"
 #include "printing/backend/print_backend.h"
 
 namespace printing {
 
+extern const char kIppCollate[];
+extern const char kIppCopies[];
+extern const char kIppColor[];
+extern const char kIppMedia[];
+extern const char kIppDuplex[];
+
+extern const char kCollated[];
+extern const char kUncollated[];
+
 // Returns the default ColorModel for |printer|.
 ColorModel DefaultColorModel(const CupsOptionProvider& printer);
 
 // Returns the set of supported ColorModels for |printer|.
 std::vector<ColorModel> SupportedColorModels(const CupsOptionProvider& printer);
 
 // Returns the default paper setting for |printer|.
 PrinterSemanticCapsAndDefaults::Paper DefaultPaper(
     const CupsOptionProvider& printer);
 
@@ skipping 15 matching lines @@
 bool CollateDefault(const CupsOptionProvider& printer);
 
 // Populates the |printer_info| object with attributes retrived using IPP from
 // |printer|.
 void CapsAndDefaultsFromPrinter(const CupsOptionProvider& printer,
                                 PrinterSemanticCapsAndDefaults* printer_info);
 
 }  // namespace printing
 
 #endif  // PRINTING_BACKEND_CUPS_IPP_UTIL_H_