[CUPS] Only allow set up a printer if manufacturer & model or the PPD file is specified.

chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.js

Index: chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.js
diff --git a/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.js b/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.js
index d2270f7c1a2fe01b487d5cc35d01b936cc3ae8d7..9049ca6237789b9cd90ab50b38ce2f2b431b1ab6 100644
--- a/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.js
+++ b/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.js
@@ -287,6 +287,17 @@ Polymer({
   getBaseName_: function(path) {
     return path.substring(path.lastIndexOf('/') + 1);
   },
+
+  /**
+   * @param {string} printerManufacturer
+   * @param {string} printerModel
+   * @param {string} printerPPDPath
+   * @return {boolean} Whether we have enough information to set up the printer
+   * @private
+   */
+   canAddPrinter_: function(printerManufacturer, printerModel, printerPPDPath) {
+     return !!((printerManufacturer && printerModel) || printerPPDPath);
+   },
 });
 
 Polymer({