Hookup the PpdProvider in the printer setup flow.

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

Index: chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.h
diff --git a/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.h b/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.h
index b959644da24312905d2c88e1580972f2667b67bd..3d6f1e9d85f2a9d1d4d288ea2abcfc7544adb800 100644
--- a/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.h
+++ b/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.h
@@ -88,6 +88,11 @@ class CupsPrintersHandler : public ::settings::SettingsPageUIHandler,
   void OnPrintersFound(const std::vector<Printer>& printers) override;
   void OnDiscoveryDone() override;
 
+  // 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_;