Code to send diagnostic messages about cloud print proxy. Currently diagnosti...

chrome/service/cloud_print/cloud_print_proxy_backend.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_CLOUD_PRINT_PROXY_BACKEND_H_
 #define CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_
 #pragma once
 
 #include <string>
 
@@ skipping 16 matching lines @@
   // There is a list of printers available that can be registered.
   virtual void OnPrinterListAvailable(
       const printing::PrinterList& printer_list) = 0;
   // We successfully authenticated with the cloud print server. This callback
   // allows the frontend to persist the tokens.
   virtual void OnAuthenticated(const std::string& cloud_print_token,
                                const std::string& cloud_print_xmpp_token,
                                const std::string& email) = 0;
   // We have invalid/expired credentials.
   virtual void OnAuthenticationFailed() = 0;
+  // The print system could not be initialized.
+  virtual void OnPrintSystemUnavailable() = 0;
 
  protected:
   // Don't delete through SyncFrontend interface.
   virtual ~CloudPrintProxyFrontend() {
   }
  private:
   DISALLOW_COPY_AND_ASSIGN(CloudPrintProxyFrontend);
 };
 
 class CloudPrintProxyBackend {
@@ skipping 27 matching lines @@
   MessageLoop* const frontend_loop_;
   // The frontend which is responsible for displaying UI and updating Prefs
   CloudPrintProxyFrontend* frontend_;
 
   friend class base::RefCountedThreadSafe<CloudPrintProxyBackend::Core>;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintProxyBackend);
 };
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_