Introduce concept of provisional destinations to print preview

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 35129115409cfaa7066c976ce5d801992a45e51e..e1e875b7a5b71037e8c65f5dd44761e44e8fe5b8 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -315,12 +315,12 @@ class PrintPreviewHandler
 
   // Called when an extension reports information for a USB printer it has just
   // been granted access to.
-  // |extension_id|: The extension that was queried.
-  // |device_id|: The id of the USB device.
+  // |provisional_destination_id|: ID used to identify the provisional print
+  //     destination for the USB printer in print preview UI.
   // |printer_info|: The data reported by the extension.
-  void OnGotExtensionUsbPrinterInfo(const std::string& extension_id,
-                                    int device_id,
-                                    const base::DictionaryValue& printer_info);
+  void OnGotExtensionUsbPrinterInfo(
+      const std::string& provisional_destination_id,
+      const base::DictionaryValue& printer_info);
 
   // Called when an extension reports the set of print capabilites for a
   // printer.