Roll to pickup pool changes

packages/barback/lib/src/graph/phase_output.dart

 // 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 barback.graph.phase_output;
 
 import 'dart:async';
 import 'dart:collection';
 
 import '../asset/asset_forwarder.dart';
@@ skipping 32 matching lines @@
   ///
   /// If there's no collision, this will only have one element. Otherwise, it
   /// will be ordered by which asset was added first.
   final _assets = new Queue<AssetNode>();
 
   /// The [AssetCollisionException] for this output, or null if there is no
   /// collision currently.
   AssetCollisionException get collisionException {
     if (_assets.length == 1) return null;
     return new AssetCollisionException(
-        _assets.where((asset) => asset.transform != null)
+        _assets
+            .where((asset) => asset.transform != null)
             .map((asset) => asset.transform.info),
         output.id);
   }
 
   PhaseOutput(this._phase, AssetNode output, this._location)
       : _outputForwarder = new AssetForwarder(output) {
     assert(!output.state.isRemoved);
     add(output);
   }
 
@@ skipping 41 matching lines @@
       // they've successfully resolved the collision or not.
       if (_assets.length > 1) {
         // TODO(nweiz): report this through the output asset.
         _phase.cascade.reportError(collisionException);
       }
     });
   }
 
   String toString() => "phase output in $_location for $output";
 }