Gather and report stats on the number of times flushed results are recomputed

pkg/analyzer/lib/task/model.dart

 // Copyright (c) 2015, 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 analyzer.task.model;
 
 import 'dart:collection';
 import 'dart:developer';
 
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 439 matching lines @@
   int measure(T object);
 }
 
 /**
  * A description of an analysis result that can be computed by an [AnalysisTask].
  *
  * Clients may not extend, implement or mix-in this class.
  */
 abstract class ResultDescriptor<V> {
   /**
+   * A comparator that can be used to sort result descriptors by their name.
+   */
+  static final Comparator<ResultDescriptor> SORT_BY_NAME =
+      (ResultDescriptor first, ResultDescriptor second) =>
+          first.name.compareTo(second.name);
+
+  /**
    * Initialize a newly created analysis result to have the given [name] and
    * [defaultValue].
    *
    * The given [cachingPolicy] is used to limit the total size of results
    * described by this descriptor. If no policy is specified, the results are
    * never evicted from the cache, and removed only when they are invalidated.
    */
   factory ResultDescriptor(String name, V defaultValue,
       {ResultCachingPolicy<V> cachingPolicy}) = ResultDescriptorImpl<V>;
 
@@ skipping 294 matching lines @@
   /**
    * A work should be done, but without any special urgency.
    */
   NORMAL,
 
   /**
    * Nothing to do.
    */
   NONE
 }