Remove PhaseInput and add TransformerSorter to barback.

pkg/barback/lib/src/node_streams.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.node_streams;
 
 import 'dart:async';
 
 import 'asset_node.dart';
 import 'log.dart';
@@ skipping 21 matching lines @@
   final onAssetController =
       new StreamController<AssetNode>.broadcast(sync: true);
 
   /// A stream that emits an event whenever any the node logs an entry.
   Stream<LogEntry> get onLog => onLogPool.stream;
   final onLogPool = new StreamPool<LogEntry>.broadcast();
   final onLogController = new StreamController<LogEntry>.broadcast(sync: true);
 
   var _previousStatus = NodeStatus.RUNNING;
 
+  /// Whether [this] has been closed.
+  bool get isClosed => onAssetController.isClosed;
+
   NodeStreams() {
     onAssetPool.add(onAssetController.stream);
     onLogPool.add(onLogController.stream);
   }
 
   /// Emits a status change notification via [onStatusChange].
   ///
   /// This guarantees that a change notification won't be emitted if the status
   /// didn't actually change.
   void changeStatus(NodeStatus status) {
     if (_previousStatus != status) _onStatusChangeController.add(status);
   }
 
   /// Closes all the streams.
   void close() {
     _onStatusChangeController.close();
     onAssetController.close();
     onAssetPool.close();
     onLogController.close();
     onLogPool.close();
   }
 }