Add a new kind of suite to ease test.dart integration.

pkg/front_end/test/fasta/dart2js_test.dart

-// Copyright (c) 2017, 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.md file.
-
-library fasta.test.dart2js_test;
-
-import 'package:test_dart/test_configurations.dart' show
-    testConfigurations;
-
-import 'package:test_dart/test_options.dart' show
-    TestOptionsParser;
-
-import 'package:test_dart/test_suite.dart' show
-    TestUtils;
-
-const String arch = "-ax64";
-
-const String mode = "-mrelease";
-
-const String processes = "-j16";
-
-const String dart2jsV8 = "-cdart2js -rd8";
-
-const String common =
-    // --dart2js-batch is ignored unless set in the first configuration.
-    "--dart2js-batch --time -pcolor --report --failure-summary";
-
-main(List<String> arguments) {
-  if (arguments.join(" ") != "--run-tests") {
-    // Protect against being run from test.dart.
-    print("Usage: dart2js_test.dart --run-tests");
-    return;
-  }
-  TestUtils.setDartDirUri(Uri.base);
-  List<String> commandLines = <String>[
-      "--checked dart2js",
-      "$dart2jsV8 --exclude-suite=observatory_ui",
-      "$dart2jsV8 dart2js_extra dart2js_native",
-    ];
-  List<Map> configurations = <Map>[];
-  for (String commandLine in commandLines) {
-    List<String> arguments = <String>[arch, mode, processes]
-        ..addAll("$common $commandLine".split(" "));
-    TestOptionsParser optionsParser = new TestOptionsParser();
-    configurations.addAll(optionsParser.parse(arguments));
-  }
-  testConfigurations(configurations);
-}