Make CUPS cloud print proxy to support multiple print servers....

chrome/service/cloud_print/print_system.h

 // Copyright (c) 2010 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_
 #pragma once
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/ref_counted.h"
 
+#include "printing/backend/print_backend.h"
+
 class DictionaryValue;
 class FilePath;
 
 namespace printing {
 class PrintBackend;
 struct PrinterBasicInfo;
+struct PrinterCapsAndDefaults;
 }
 
 // This is the interface for platform-specific code for cloud print
 namespace cloud_print {
 
 typedef int PlatformJobId;
 
 enum PrintJobStatus {
   PRINT_JOB_STATUS_INVALID,
   PRINT_JOB_STATUS_IN_PROGRESS,
@@ skipping 90 matching lines @@
     virtual bool Spool(const std::string& print_ticket,
                        const FilePath& print_data_file_path,
                        const std::string& print_data_mime_type,
                        const std::string& printer_name,
                        const std::string& job_title,
                        JobSpooler::Delegate* delegate) = 0;
   };
 
   virtual ~PrintSystem();
 
-  // Get the printing backend.
-  virtual printing::PrintBackend* GetPrintBackend() = 0;
+  // Initialize print system. This need to be called before any other function
+  // of PrintSystem.
+  virtual void Init() = 0;
+
+  // Enumerates the list of installed local and network printers.
+  virtual void EnumeratePrinters(printing::PrinterList* printer_list) = 0;
+
+  // Gets the capabilities and defaults for a specific printer.
+  virtual bool GetPrinterCapsAndDefaults(
+      const std::string& printer_name,
+      printing::PrinterCapsAndDefaults* printer_info) = 0;
+
+  // Returns true if printer_name points to a valid printer.
+  virtual bool IsValidPrinter(const std::string& printer_name) = 0;
 
   // Returns true if ticket is valid.
   virtual bool ValidatePrintTicket(const std::string& printer_name,
                                    const std::string& print_ticket_data) = 0;
 
   // Get details for already spooled job.
   virtual bool GetJobDetails(const std::string& printer_name,
                              PlatformJobId job_id,
                              PrintJobDetails *job_details) = 0;
 
@@ skipping 19 matching lines @@
 // Visual Studio where it gets confused between multiple Delegate
 // classes and gives a C2500 error. (I saw this error on the try bots -
 // the workaround was not needed for my machine).
 typedef PrintSystem::PrintServerWatcher::Delegate PrintServerWatcherDelegate;
 typedef PrintSystem::PrinterWatcher::Delegate PrinterWatcherDelegate;
 typedef PrintSystem::JobSpooler::Delegate JobSpoolerDelegate;
 
 }  // namespace cloud_print
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_PRINT_SYSTEM_H_