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

chrome/service/cloud_print/print_system_win.cc

Index: chrome/service/cloud_print/print_system_win.cc
===================================================================
--- chrome/service/cloud_print/print_system_win.cc	(revision 64663)
+++ chrome/service/cloud_print/print_system_win.cc	(working copy)
@@ -239,8 +239,16 @@
   PrintSystemWin();
 
   // PrintSystem implementation.
-  virtual printing::PrintBackend* GetPrintBackend();
+  virtual void Init();
 
+  virtual void EnumeratePrinters(printing::PrinterList* printer_list);
+
+  virtual bool GetPrinterCapsAndDefaults(
+      const std::string& printer_name,
+      printing::PrinterCapsAndDefaults* printer_info);
+
+  virtual bool IsValidPrinter(const std::string& printer_name);
+
   virtual bool ValidatePrintTicket(const std::string& printer_name,
                                    const std::string& print_ticket_data);
 
@@ -508,23 +516,30 @@
   virtual PrintSystem::JobSpooler* CreateJobSpooler();
 
  private:
-  void Init();
-
   scoped_refptr<printing::PrintBackend> print_backend_;
 };
 
 PrintSystemWin::PrintSystemWin() {
-  Init();
+  print_backend_ = printing::PrintBackend::CreateInstance(NULL);
 }
 
 void PrintSystemWin::Init() {
-  print_backend_ = printing::PrintBackend::CreateInstance(NULL);
 }
 
-printing::PrintBackend* PrintSystemWin::GetPrintBackend() {
-  return print_backend_;
+void PrintSystemWin::EnumeratePrinters(printing::PrinterList* printer_list) {
+  print_backend_->EnumeratePrinters(printer_list);
 }
 
+bool PrintSystemWin::GetPrinterCapsAndDefaults(
+    const std::string& printer_name,
+    printing::PrinterCapsAndDefaults* printer_info) {
+  return print_backend_->GetPrinterCapsAndDefaults(printer_name, printer_info);
+}
+
+bool PrintSystemWin::IsValidPrinter(const std::string& printer_name) {
+  return print_backend_->IsValidPrinter(printer_name);
+}
+
 bool PrintSystemWin::ValidatePrintTicket(
     const std::string& printer_name,
     const std::string& print_ticket_data) {