Perform printer setup on Chrome OS before selecting printer.

chrome/browser/ui/webui/print_preview/print_preview_handler.h

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.h b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
index 56a737952dbf7504e6114e8e2d6f6068d083e812..37a040befbfa3a84a2eadfd09602aeadb5c7235b 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -155,6 +155,9 @@ class PrintPreviewHandler
   // Gets the printer capabilities. First element of |args| is the printer name.
   void HandleGetPrinterCapabilities(const base::ListValue* args);
 
+  // Performs printer setup. First element of |args| is the printer name.
+  void HandlePrinterSetup(const base::ListValue* args);
+
 #if BUILDFLAG(ENABLE_BASIC_PRINT_DIALOG)
   // Asks the initiator renderer to show the native print system dialog. |args|
   // is unused.
@@ -219,6 +222,11 @@ class PrintPreviewHandler
       const std::string& printer_name,
       std::unique_ptr<base::DictionaryValue> settings_info);
 
+  // Send the result of performing printer setup. |settings_info| contains
+  // printer capabilities.
+  void SendPrinterSetup(const std::string& printer_name,
+                        std::unique_ptr<base::DictionaryValue> settings_info);
+
   // Send the list of printers to the Web UI.
   void SetupPrinterList(const printing::PrinterList& printer_list);