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

sdk/lib/_internal/pub_generated/lib/src/barback/rewrite_import_transformer.dart

Index: sdk/lib/_internal/pub_generated/lib/src/barback/rewrite_import_transformer.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/rewrite_import_transformer.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/rewrite_import_transformer.dart
similarity index 56%
copy from sdk/lib/_internal/pub/lib/src/barback/rewrite_import_transformer.dart
copy to sdk/lib/_internal/pub_generated/lib/src/barback/rewrite_import_transformer.dart
index 7482d620a840df40be7a5ecdb6c093888f231a6a..bea129efbedb2acd2bd9960cac5ea6294d512c49 100644
--- a/sdk/lib/_internal/pub/lib/src/barback/rewrite_import_transformer.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/rewrite_import_transformer.dart
@@ -1,38 +1,24 @@
-// Copyright (c) 2013, 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.rewrite_import_transformer;
-
 import 'dart:async';
-
 import 'package:barback/barback.dart';
-
 import '../dart.dart';
-
-/// A transformer used internally to rewrite "package:" imports so they point to
-/// the barback server rather than to pub's package root.
 class RewriteImportTransformer extends Transformer {
   String get allowedExtensions => '.dart';
-
   Future apply(Transform transform) {
     return transform.primaryInput.readAsString().then((contents) {
-      var directives = parseImportsAndExports(contents,
-          name: transform.primaryInput.id.toString());
-
+      var directives =
+          parseImportsAndExports(contents, name: transform.primaryInput.id.toString());
       var buffer = new StringBuffer();
       var index = 0;
       for (var directive in directives) {
         var uri = Uri.parse(directive.uri.stringValue);
         if (uri.scheme != 'package') continue;
-
         buffer
-          ..write(contents.substring(index, directive.uri.literal.offset))
-          ..write('"/packages/${uri.path}"');
+            ..write(contents.substring(index, directive.uri.literal.offset))
+            ..write('"/packages/${uri.path}"');
         index = directive.uri.literal.end;
       }
       buffer.write(contents.substring(index, contents.length));
-
       transform.addOutput(
           new Asset.fromString(transform.primaryInput.id, buffer.toString()));
     });