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

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 617 matching lines @@
    * * The status file uses the same name.
    * * Test files are directly in that directory and end in "_test.dart".
    *
    * If you follow that convention, then you can construct one of these like:
    *
    * new StandardTestSuite.forDirectory(configuration, 'path/to/mytestsuite');
    *
    * instead of having to create a custom [StandardTestSuite] subclass. In
    * particular, if you add 'path/to/mytestsuite' to [TEST_SUITE_DIRECTORIES]
    * in test.dart, this will all be set up for you.
-   *
-   * The [StandardTestSuite] also optionally takes a list of servers that have
-   * been started up by the test harness, to be used by browser tests.
    */
-  factory StandardTestSuite.forDirectory(Map configuration, Path directory) {
-    final name = directory.filename;
+  factory StandardTestSuite.forDirectory(Map configuration, Path directory,
+      [String name]) {
+    if (name == null) name = directory.filename;
 
     var status_paths = ['$directory/$name.status',
                         '$directory/.status',
                         '$directory/${name}_dart2js.status',
                         '$directory/${name}_analyzer.status',
                         '$directory/${name}_analyzer2.status'];
 
     return new StandardTestSuite(configuration,
         name, directory,
         status_paths,
@@ skipping 1637 matching lines @@
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
   }
 }