Add a top-level typed_mock package.

pkg/analysis_server/test/test_all.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.
 
 import 'package:unittest/unittest.dart';
 
 import 'analysis_server_test.dart' as analysis_server_test;
 import 'channel_test.dart' as channel_test;
 import 'domain_context_test.dart' as domain_context_test;
 import 'domain_server_test.dart' as domain_server_test;
 import 'protocol_test.dart' as protocol_test;
 import 'socket_server_test.dart' as socket_server_test;
-import 'typed_mock_test.dart' as typed_mock_test;
 
 /// Utility for manually running all tests
 main() {
   group('analysis_server', () {
     analysis_server_test.main();
     channel_test.main();
     domain_context_test.main();
     domain_server_test.main();
     protocol_test.main();
     socket_server_test.main();
-    typed_mock_test.main();
   });
 }