Intial support for unifying command-line handling

pkg/analyzer/test/src/test_all.dart

 // Copyright (c) 2015, 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 analyzer.test.src.test_all;
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
+import 'command_line/test_all.dart' as command_line;
 import 'context/test_all.dart' as context;
 import 'dart/test_all.dart' as dart;
 import 'plugin/plugin_config_test.dart' as plugin;
 import 'source/test_all.dart' as source;
 import 'summary/test_all.dart' as summary;
 import 'task/test_all.dart' as task;
 import 'util/test_all.dart' as util;
 
 /// Utility for manually running all tests.
 main() {
   defineReflectiveSuite(() {
+    command_line.main();
     context.main();
     dart.main();
     plugin.main();
     source.main();
     summary.main();
     task.main();
     util.main();
   }, name: 'src');
 }