Increase delay when after eventually consistent operations in datastore/storage

test/db/e2e/db_test_impl.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library db_test;
 
 /// NOTE: In order to run these tests, the following datastore indices must
 /// exist:
 /// $ cat index.yaml
 /// indexes:
@@ skipping 35 matching lines @@
 
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 import 'package:gcloud/db.dart' as db;
 import 'package:gcloud/src/datastore_impl.dart' as datastore_impl;
 
 import '../../datastore/e2e/datastore_test_impl.dart' as datastore_test;
 import '../../common_e2e.dart';
 
-// Note:
-// Non-ancestor queries (i.e. queries not lookups) result in index scans.
-// The index tables are updated in a "eventually consistent" way.
-//
-// So this can make tests flaky, if the index updates take longer than the
-// following constant.
-const INDEX_UPDATE_DELAY = const Duration(seconds: 10);
-
 @db.Kind()
 class Person extends db.Model {
   @db.StringProperty()
   String name;
 
   @db.IntProperty()
   int age;
 
   @db.ModelKeyProperty()
   db.Key wife;
@@ skipping 543 matching lines @@
 main() {
   var scopes = datastore_impl.DatastoreImpl.SCOPES;
 
   withAuthClient(scopes, (String project, httpClient) {
     var datastore = new datastore_impl.DatastoreImpl(httpClient, 's~$project');
     return datastore_test.cleanupDB(datastore).then((_) {
       return runE2EUnittest(() => runTests(new db.DatastoreDB(datastore)));
     });
   });
 }