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

sdk/lib/_internal/pub_generated/test/cache/add/missing_package_arg_test.dart

Index: sdk/lib/_internal/pub_generated/test/cache/add/missing_package_arg_test.dart
diff --git a/sdk/lib/_internal/pub/test/cache/add/missing_package_arg_test.dart b/sdk/lib/_internal/pub_generated/test/cache/add/missing_package_arg_test.dart
similarity index 65%
copy from sdk/lib/_internal/pub/test/cache/add/missing_package_arg_test.dart
copy to sdk/lib/_internal/pub_generated/test/cache/add/missing_package_arg_test.dart
index be4216b88f8403803181ee329b575acfb13ed558..669c937777ab36b8a958849660a5b3f1a23015d7 100644
--- a/sdk/lib/_internal/pub/test/cache/add/missing_package_arg_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/cache/add/missing_package_arg_test.dart
@@ -1,17 +1,10 @@
-// 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.
-
 library pub_tests;
-
 import '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../test_pub.dart';
-
 main() {
   initConfig();
   integration('fails if no package was given', () {
-    schedulePub(args: ["cache", "add"],
-        error: """
+    schedulePub(args: ["cache", "add"], error: """
             No package to add given.
             
             Usage: pub cache add <package> [--version <constraint>] [--all]
@@ -21,7 +14,6 @@ main() {
 
             Run "pub help" to see global options.
             See http://dartlang.org/tools/pub/cmd/pub-cache.html for detailed documentation.
-            """,
-        exitCode: exit_codes.USAGE);
+            """, exitCode: exit_codes.USAGE);
   });
 }