Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/test/dart2js/compiles_entrypoints_in_root_package_test.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:scheduled_test/scheduled_test.dart';
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-  integration("compiles Dart entrypoints in root package to JS", () {
-    // Dart2js can take a long time to compile dart code, so we increase the
-    // timeout to cope with that.
-    currentSchedule.timeout *= 3;
-
-    d.dir(
-        appPath,
-        [
-            d.appPubspec(),
-            d.dir(
-                'benchmark',
-                [
-                    d.file('file.dart', 'void main() => print("hello");'),
-                    d.file('lib.dart', 'void foo() => print("hello");'),
-                    d.dir('subdir', [d.file('subfile.dart', 'void main() => print("ping");')])]),
-            d.dir(
-                'foo',
-                [
-                    d.file('file.dart', 'void main() => print("hello");'),
-                    d.file('lib.dart', 'void foo() => print("hello");'),
-                    d.dir('subdir', [d.file('subfile.dart', 'void main() => print("ping");')])]),
-            d.dir(
-                'web',
-                [
-                    d.file('file.dart', 'void main() => print("hello");'),
-                    d.file('lib.dart', 'void foo() => print("hello");'),
-                    d.dir(
-                        'subdir',
-                        [d.file('subfile.dart', 'void main() => print("ping");')])])]).create();
-
-    schedulePub(
-        args: ["build", "benchmark", "foo", "web"],
-        output: new RegExp(r'Built 6 files to "build".'));
-
-    d.dir(
-        appPath,
-        [
-            d.dir(
-                'build',
-                [
-                    d.dir(
-                        'benchmark',
-                        [
-                            d.matcherFile('file.dart.js', isNot(isEmpty)),
-                            d.nothing('file.dart'),
-                            d.nothing('lib.dart'),
-                            d.dir(
-                                'subdir',
-                                [
-                                    d.matcherFile('subfile.dart.js', isNot(isEmpty)),
-                                    d.nothing('subfile.dart')])]),
-                    d.dir(
-                        'foo',
-                        [
-                            d.matcherFile('file.dart.js', isNot(isEmpty)),
-                            d.nothing('file.dart'),
-                            d.nothing('lib.dart'),
-                            d.dir(
-                                'subdir',
-                                [
-                                    d.matcherFile('subfile.dart.js', isNot(isEmpty)),
-                                    d.nothing('subfile.dart')])]),
-                    d.dir(
-                        'web',
-                        [
-                            d.matcherFile('file.dart.js', isNot(isEmpty)),
-                            d.nothing('file.dart'),
-                            d.nothing('lib.dart'),
-                            d.dir(
-                                'subdir',
-                                [
-                                    d.matcherFile('subfile.dart.js', isNot(isEmpty)),
-                                    d.nothing('subfile.dart')])])])]).validate();
-  });
-}