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

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

Index: sdk/lib/_internal/pub_generated/lib/src/barback/pub_package_provider.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/pub_package_provider.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/pub_package_provider.dart
similarity index 53%
copy from sdk/lib/_internal/pub/lib/src/barback/pub_package_provider.dart
copy to sdk/lib/_internal/pub_generated/lib/src/barback/pub_package_provider.dart
index 36ec86594aac6f6093217fd7971613e8156d15dd..52250d472f6a26aeaff4aeb1c84e175a77c331dc 100644
--- a/sdk/lib/_internal/pub/lib/src/barback/pub_package_provider.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/pub_package_provider.dart
@@ -1,71 +1,43 @@
-// 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.pub_package_provider;
-
 import 'dart:async';
-
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
-
 import '../io.dart';
 import '../package_graph.dart';
 import '../preprocess.dart';
 import '../sdk.dart' as sdk;
 import '../utils.dart';
-
-/// An implementation of barback's [PackageProvider] interface so that barback
-/// can find assets within pub packages.
 class PubPackageProvider implements PackageProvider {
   final PackageGraph _graph;
   final List<String> packages;
-
   PubPackageProvider(PackageGraph graph, [Iterable<String> packages])
       : _graph = graph,
-        packages = [r"$pub", r"$sdk"]
-            ..addAll(packages == null ? graph.packages.keys : packages);
-
+        packages = [
+          r"$pub",
+          r"$sdk"]..addAll(packages == null ? graph.packages.keys : packages);
   Future<Asset> getAsset(AssetId id) {
-    // "$pub" is a psuedo-package that allows pub's transformer-loading
-    // infrastructure to share code with pub proper.
     if (id.package == r'$pub') {
       var components = path.url.split(id.path);
       assert(components.isNotEmpty);
       assert(components.first == 'lib');
       components[0] = 'dart';
       var file = assetPath(path.joinAll(components));
-
-      // Barback may not be in the package graph if there are no user-defined
-      // transformers being used at all. The "$pub" sources are still provided,
-      // but will never be loaded.
       if (!_graph.packages.containsKey("barback")) {
         return new Future.value(new Asset.fromPath(id, file));
       }
-
-      var versions = mapMap(_graph.packages,
-          value: (_, package) => package.version);
+      var versions =
+          mapMap(_graph.packages, value: (_, package) => package.version);
       var contents = readTextFile(file);
       contents = preprocess(contents, versions, path.toUri(file));
       return new Future.value(new Asset.fromString(id, contents));
     }
-
-    // "$sdk" is a pseudo-package that provides access to the Dart library
-    // sources in the SDK. The dart2js transformer uses this to locate the Dart
-    // sources for "dart:" libraries.
     if (id.package == r'$sdk') {
-      // The asset path contains two "lib" entries. The first represent's pub's
-      // concept that all public assets are in "lib". The second comes from the
-      // organization of the SDK itself. Strip off the first. Leave the second
-      // since dart2js adds it and expects it to be there.
       var parts = path.split(path.fromUri(id.path));
       assert(parts.isNotEmpty && parts[0] == 'lib');
       parts = parts.skip(1);
-
       var file = path.join(sdk.rootDirectory, path.joinAll(parts));
       return new Future.value(new Asset.fromPath(id, file));
     }
-
     var nativePath = path.fromUri(id.path);
     var file = path.join(_graph.packages[id.package].dir, nativePath);
     return new Future.value(new Asset.fromPath(id, file));