Increase the default test timeout for scheduled tests on Windows.

pkg/scheduled_test/test/metatest.dart

Index: pkg/scheduled_test/test/metatest.dart
diff --git a/pkg/scheduled_test/test/metatest.dart b/pkg/scheduled_test/test/metatest.dart
index 0771ff41a42dee7e2fac9594c3129755760c77fd..71ad421fd9165c9adb29c5d598e2b37f84633103 100644
--- a/pkg/scheduled_test/test/metatest.dart
+++ b/pkg/scheduled_test/test/metatest.dart
@@ -15,6 +15,7 @@ import 'dart:isolate';
 
 import 'package:pathos/path.dart' as path;
 import 'package:unittest/unittest.dart';
+import 'package:scheduled_test/scheduled_test.dart' as scheduled_test;
 
 import 'utils.dart';
 
@@ -71,6 +72,14 @@ void expectTestsFail(String description, void body()) {
   });
 }
 
+/// Runs [setUpFn] before every metatest. Note that [setUpFn] will be
+/// overwritten if the test itself calls [setUp].
+void metaSetUp(void setUpFn()) {
+  _inChildIsolate.then((inIsolate) {
+    if (inIsolate) scheduled_test.setUp(setUpFn);
+  });
+}
+
 /// Sets up a test with the given [description] and [body]. After the test runs,
 /// calls [validate] with the result map.
 void _setUpTest(String description, void body(), void validate(Map)) {