Roll to pickup pool changes

packages/barback/lib/src/transformer/transform.dart

 // 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 barback.transformer.transform;
 
 import 'dart:async';
 import 'dart:convert';
 
 import '../asset/asset.dart';
 import '../asset/asset_id.dart';
 import '../errors.dart';
 import 'aggregate_transform.dart';
 import 'transform_logger.dart';
 
 /// Creates a new [Transform] wrapping an [AggregateTransform].
 ///
 /// Although barback internally works in terms of [AggregateTransformer]s, most
 /// transformers only work on individual primary inputs in isolation. We want to
 /// allow those transformers to implement the more user-friendly [Transformer]
 /// interface which takes the more user-friendly [Transform] object. This method
 /// wraps the more general [AggregateTransform] to return a [Transform] instead.
 Future<Transform> newTransform(AggregateTransform aggregate) {
   // A wrapped [Transformer] will assign each primary input a unique transform
   // key, so we can safely get the first asset emitted. We don't want to wait
   // for the stream to close, since that requires barback to prove that no more
   // new assets will be generated.
-  return aggregate.primaryInputs.first.then((primaryInput) =>
-      new Transform._(aggregate, primaryInput));
+  return aggregate.primaryInputs.first
+      .then((primaryInput) => new Transform._(aggregate, primaryInput));
 }
 
 /// While a [Transformer] represents a *kind* of transformation, this defines
 /// one specific usage of it on a set of files.
 ///
 /// This ephemeral object exists only during an actual transform application to
 /// facilitate communication between the [Transformer] and the code hosting
 /// the transformation. It lets the [Transformer] access inputs and generate
 /// outputs.
 class Transform {
@@ skipping 55 matching lines @@
 
   /// Consume the primary input so that it doesn't get processed by future
   /// phases or emitted once processing has finished.
   ///
   /// Normally the primary input will automatically be forwarded unless the
   /// transformer overwrites it by emitting an input with the same id. This
   /// allows the transformer to tell barback not to forward the primary input
   /// even if it's not overwritten.
   void consumePrimary() => _aggregate.consumePrimary(primaryInput.id);
 }