Add policy to use system default printer

chrome/test/data/webui/print_preview/print_preview_ui_browsertest.js

Index: chrome/test/data/webui/print_preview/print_preview_ui_browsertest.js
diff --git a/chrome/test/data/webui/print_preview/print_preview_ui_browsertest.js b/chrome/test/data/webui/print_preview/print_preview_ui_browsertest.js
index f0f47db9eaebbbee9382bb7ed818d3b90e19bea0..929f107e09c5c5e0a795dd5708c4def9f516a64a 100644
--- a/chrome/test/data/webui/print_preview/print_preview_ui_browsertest.js
+++ b/chrome/test/data/webui/print_preview/print_preview_ui_browsertest.js
@@ -114,3 +114,10 @@ PrintPreviewUIBrowserTest.prototype = {
     mocha.grep(new RegExp(testName + '\\b')).run();
   });
 });
+
+GEN('#if !defined(OS_CHROMEOS)');
+TEST_F('PrintPreviewUIBrowserTest', 'SystemDefaultPrinterPolicy', function() {
+  loadTimeData.overrideValues({useSystemDefaultPrinter: true});
+  mocha.grep(new RegExp('SystemDefaultPrinterPolicy' + '\\b')).run();
+});
+GEN('#endif');