Fallback to CDD/CJT if connector can't initialize XPS API.

chrome/service/cloud_print/print_system.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 CHROME_SERVICE_CLOUD_PRINT_PRINT_SYSTEM_H_
 #define CHROME_SERVICE_CLOUD_PRINT_PRINT_SYSTEM_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 177 matching lines @@
                              PlatformJobId job_id,
                              PrintJobDetails* job_details) = 0;
 
   // Factory methods to create corresponding watcher. Callee is responsible
   // for deleting objects. Return NULL if failed.
   virtual PrintServerWatcher* CreatePrintServerWatcher() = 0;
   virtual PrinterWatcher* CreatePrinterWatcher(
       const std::string& printer_name) = 0;
   virtual JobSpooler* CreateJobSpooler() = 0;
 
+  // Returns a true if connector should use CDD for capabilities and CJT as
+  // print ticket.
+  virtual bool UseCddAndCjt() = 0;
+
   // Returns a comma separated list of mimetypes for print data that are
   // supported by this print system. The format of this string is the same as
   // that used for the HTTP Accept: header.
   virtual std::string GetSupportedMimeTypes() = 0;
 
   // Generate unique for proxy.
   static std::string GenerateProxyId();
 
   // Call this function to obtain printing system for specified print server.
   // If print settings are NULL, default settings will be used.
   // Return NULL if no print system available.
   static scoped_refptr<PrintSystem> CreateInstance(
       const base::DictionaryValue* print_system_settings);
 
  protected:
   friend class base::RefCountedThreadSafe<PrintSystem>;
   virtual ~PrintSystem();
 };
 
 }  // namespace cloud_print
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_PRINT_SYSTEM_H_