Removed fixed dependencies

packages/analyzer/lib/src/task/model.dart

Index: packages/analyzer/lib/src/task/model.dart
diff --git a/packages/analyzer/lib/src/task/model.dart b/packages/analyzer/lib/src/task/model.dart
index 50c05eed6ce1528fbda9f8552c282942cb51c426..47de4b3143399d07dd27a609fcfcd161d4d3b6a6 100644
--- a/packages/analyzer/lib/src/task/model.dart
+++ b/packages/analyzer/lib/src/task/model.dart
@@ -4,14 +4,14 @@
 
 library analyzer.src.task.model;
 
-import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
+import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/task/inputs.dart';
 import 'package:analyzer/task/model.dart';
 
 /**
  * The default [ResultCachingPolicy], results are never flushed.
  */
-const ResultCachingPolicy DEFAULT_CACHING_POLICY =
+const ResultCachingPolicy<Object> DEFAULT_CACHING_POLICY =
     const SimpleResultCachingPolicy(-1, -1);
 
 /**
@@ -125,14 +125,24 @@ class TaskDescriptorImpl implements TaskDescriptor {
   @override
   final List<ResultDescriptor> results;
 
+  /**
+   * The function used to determine whether the described task is suitable for
+   * a given target.
+   */
+  final SuitabilityFor _suitabilityFor;
+
   /**
    * Initialize a newly created task descriptor to have the given [name] and to
-   * describe a task that takes the inputs built using the given [createTaskInputs],
-   * and produces the given [results]. The [buildTask] will be used to create
-   * the instance of [AnalysisTask] thusly described.
+   * describe a task that takes the inputs built using the given [inputBuilder],
+   * and produces the given [results]. The [buildTask] function will be used to
+   * create the instance of [AnalysisTask] being described. If provided, the
+   * [isAppropriateFor] function will be used to determine whether the task can
+   * be used on a specific target.
    */
   TaskDescriptorImpl(
-      this.name, this.buildTask, this.createTaskInputs, this.results);
+      this.name, this.buildTask, this.createTaskInputs, this.results,
+      {SuitabilityFor suitabilityFor})
+      : _suitabilityFor = suitabilityFor ?? _defaultSuitability;
 
   @override
   AnalysisTask createTask(AnalysisContext context, AnalysisTarget target,
@@ -142,6 +152,17 @@ class TaskDescriptorImpl implements TaskDescriptor {
     return task;
   }
 
+  @override
+  TaskSuitability suitabilityFor(AnalysisTarget target) =>
+      _suitabilityFor(target);
+
   @override
   String toString() => name;
+
+  /**
+   * The function that will be used to determine the suitability of a task if no
+   * other function is provided.
+   */
+  static TaskSuitability _defaultSuitability(AnalysisTarget target) =>
+      TaskSuitability.LOWEST;
 }