Regenerate pub sources.

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

Index: sdk/lib/_internal/pub_generated/lib/src/barback/excluding_transformer.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_transformer.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_transformer.dart
index 4bd8cd89b8b0e0549c7a632394a077f9fc01c2b1..52d90a991d2d9760ee5115fe4c248c2bd9ac02e5 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_transformer.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_transformer.dart
@@ -1,11 +1,27 @@
+// 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.excluding_transformer;
+
 import 'dart:async';
+
 import 'package:barback/barback.dart';
+
 import 'transformer_config.dart';
+
+/// Decorates an inner [Transformer] and handles including and excluding
+/// primary inputs.
 class ExcludingTransformer extends Transformer {
+  /// If [config] defines includes or excludes, wraps [inner] in an
+  /// [ExcludingTransformer] that handles those.
+  ///
+  /// Otherwise, just returns [inner] unmodified.
   static Transformer wrap(Transformer inner, TransformerConfig config) {
     if (!config.hasExclusions) return inner;
+
     if (inner is LazyTransformer) {
+      // TODO(nweiz): Remove these unnecessary "as"es when issue 19046 is fixed.
       return new _LazyExcludingTransformer(inner as LazyTransformer, config);
     } else if (inner is DeclaringTransformer) {
       return new _DeclaringExcludingTransformer(
@@ -15,24 +31,34 @@ class ExcludingTransformer extends Transformer {
       return new ExcludingTransformer._(inner, config);
     }
   }
+
   final Transformer _inner;
+
+  /// The config containing rules for which assets to include or exclude.
   final TransformerConfig _config;
+
   ExcludingTransformer._(this._inner, this._config);
+
   isPrimary(AssetId id) {
     if (!_config.canTransform(id.path)) return false;
     return _inner.isPrimary(id);
   }
+
   Future apply(Transform transform) => _inner.apply(transform);
+
   String toString() => _inner.toString();
 }
+
 class _DeclaringExcludingTransformer extends ExcludingTransformer implements
     DeclaringTransformer {
   _DeclaringExcludingTransformer(DeclaringTransformer inner,
       TransformerConfig config)
       : super._(inner as Transformer, config);
+
   Future declareOutputs(DeclaringTransform transform) =>
       (_inner as DeclaringTransformer).declareOutputs(transform);
 }
+
 class _LazyExcludingTransformer extends _DeclaringExcludingTransformer
     implements LazyTransformer {
   _LazyExcludingTransformer(DeclaringTransformer inner,