Enable the new task model everywhere

pkg/analyzer/lib/src/generated/engine.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 engine;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:math' as math;
 
@@ skipping 5918 matching lines @@
   /**
    * The partition manager being used to manage the shared partitions.
    */
   final newContext.PartitionManager partitionManager_new =
       new newContext.PartitionManager();
 
   /**
    * A flag indicating whether the (new) task model should be used to perform
    * analysis.
    */
-  bool useTaskModel = false;
+  bool useTaskModel = true;
 
   /**
    * A flag indicating whether the task model should attempt to limit
    * invalidation after a change.
    */
   bool limitInvalidationInTaskModel = false;
 
   /**
    * The plugins that are defined outside the `analyzer` package.
    */
@@ skipping 6161 matching lines @@
     PendingFuture pendingFuture =
         new PendingFuture<T>(_context, source, computeValue);
     if (!pendingFuture.evaluate(sourceEntry)) {
       _context._pendingFutureSources
           .putIfAbsent(source, () => <PendingFuture>[])
           .add(pendingFuture);
     }
     return pendingFuture.future;
   }
 }