Present the printer list from preferences for Chrome OS.

printing/backend/print_backend.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_BACKEND_PRINT_BACKEND_H_
 #define PRINTING_BACKEND_PRINT_BACKEND_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "printing/print_job_constants.h"
 #include "printing/printing_export.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 // This is the interface for platform-specific code for a print backend
 namespace printing {
 
 // Note: There are raw values. The |printer_name| and |printer_description|
 // require further interpretation on Mac. See existing callers for examples.

[Lei Zhang, 2016/11/03 07:39:50]

Update comment.

[skau, 2016/11/03 21:58:27]

Done.

 struct PRINTING_EXPORT PrinterBasicInfo {
   PrinterBasicInfo();
   PrinterBasicInfo(const PrinterBasicInfo& other);
   ~PrinterBasicInfo();
 
+#if defined(OS_CHROMEOS)
+  std::string printer_display_name;
+#endif
   std::string printer_name;
   std::string printer_description;
   int printer_status;
   int is_default;
   std::map<std::string, std::string> options;
 };
 
 using PrinterList = std::vector<PrinterBasicInfo>;
 
 struct PRINTING_EXPORT PrinterSemanticCapsAndDefaults {
@@ skipping 88 matching lines @@
   static void SetNativeCupsEnabled(bool enabled);
 
  protected:
   friend class base::RefCountedThreadSafe<PrintBackend>;
   virtual ~PrintBackend();
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_BACKEND_PRINT_BACKEND_H_