Hookup the PpdProvider in the printer setup flow.

chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.h

 // Copyright 2016 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_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_CUPS_PRINTERS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_CUPS_PRINTERS_HANDLER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 #include "chromeos/printing/ppd_provider.h"
 #include "chromeos/printing/printer_configuration.h"
 #include "chromeos/printing/printer_discoverer.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
@@ skipping 59 matching lines @@
                     int index,
                     void* params) override;
 
   void HandleStartDiscovery(const base::ListValue* args);
   void HandleStopDiscovery(const base::ListValue* args);
 
   // chromeos::PrinterDiscoverer::Observer override:
   void OnPrintersFound(const std::vector<Printer>& printers) override;
   void OnDiscoveryDone() override;
 
+  // Invokes debugd to add the printer to CUPS.  If |ipp_everywhere| is true,
+  // automatic configuration will be attempted  and |ppd_path| is ignored.
+  // |ppd_path| is the path to a Postscript Printer Description file that will
+  // be used to configure the printer capabilities.  This file must be in
+  // Downloads or the PPD Cache.
+  void AddPrinterToCups(std::unique_ptr<Printer> printer,
+                        const base::FilePath& ppd_path,
+                        bool ipp_everywhere);
+
+  // Callback for PpdProvider::ResolveCallback.
+  void OnPPDResolved(std::unique_ptr<Printer> printer,
+                     printing::PpdProvider::CallbackResultCode result,
+                     base::FilePath ppd_path);
+
   std::unique_ptr<chromeos::PrinterDiscoverer> printer_discoverer_;
   std::unique_ptr<chromeos::printing::PpdProvider> ppd_provider_;
 
   Profile* profile_;
   scoped_refptr<ui::SelectFileDialog> select_file_dialog_;
   std::string webui_callback_id_;
 
   base::WeakPtrFactory<CupsPrintersHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CupsPrintersHandler);
 };
 
 }  // namespace settings
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_CUPS_PRINTERS_HANDLER_H_