Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/transformer/loads_an_aggregate_transformer_test.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;
-
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
-
 const AGGREGATE_TRANSFORMER = """
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as p;
 
 class ManyToOneTransformer extends AggregateTransformer {
   ManyToOneTransformer.asPlugin();
 
   String classifyPrimary(AssetId id) {
     if (id.extension != '.txt') return null;
     return p.url.dirname(id.path);
   }
 
   Future apply(AggregateTransform transform) {
     return transform.primaryInputs.toList().then((assets) {
       assets.sort((asset1, asset2) => asset1.id.path.compareTo(asset2.id.path));
       return Future.wait(assets.map((asset) => asset.readAsString()));
     }).then((contents) {
       var id = new AssetId(transform.package,
           p.url.join(transform.key, 'out.txt'));
       transform.addOutput(new Asset.fromString(id, contents.join('\\n')));
     });
   }
 }
 """;
-
 main() {
   initConfig();
   withBarbackVersions(">=0.14.1", () {
     integration("loads an aggregate transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp"]
         }),
-        d.dir("lib", [
-          d.file("transformer.dart", AGGREGATE_TRANSFORMER),
-        ]),
-        d.dir("web", [
-          d.file("foo.txt", "foo"),
-          d.file("bar.txt", "bar")
-        ])
-      ]).create();
-
+            d.dir("lib", [d.file("transformer.dart", AGGREGATE_TRANSFORMER)]),
+            d.dir("web", [d.file("foo.txt", "foo"), d.file("bar.txt", "bar")])]).create();
       createLockFile('myapp', pkg: ['barback']);
-
       pubServe();
       requestShouldSucceed("out.txt", "bar\nfoo");
       endPubServe();
     });
   });
 }