Create a task in the new task model to compute constant dependencies.

pkg/analyzer/test/generated/all_the_rest_test.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.all_the_rest_test;
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 8034 matching lines @@
   void _assertNoArcs() {
     Set<Element> tails = _referenceGraph.getTails(_head);
     expect(tails, hasLength(0));
   }
   void _assertOneArc(Element tail) {
     Set<Element> tails = _referenceGraph.getTails(_head);
     expect(tails, hasLength(1));
     expect(tails.first, same(tail));
   }
   ReferenceFinder _createReferenceFinder(Element source) =>
-      new ReferenceFinder(source, _referenceGraph);
+      new ReferenceFinder((Element dependency) {
+    _referenceGraph.addEdge(source, dependency);
+  });
   SuperConstructorInvocation _makeTailSuperConstructorInvocation(
       String name, bool isConst) {
     List<ConstructorInitializer> initializers =
         new List<ConstructorInitializer>();
     ConstructorDeclaration constructorDeclaration = AstFactory
         .constructorDeclaration(AstFactory.identifier3(name), null,
             AstFactory.formalParameterList(), initializers);
     if (isConst) {
       constructorDeclaration.constKeyword = new KeywordToken(Keyword.CONST, 0);
     }
@@ skipping 589 matching lines @@
     if (_expectedExternalScriptName == null) {
       expect(scriptSource, isNull, reason: "script $scriptIndex");
     } else {
       expect(scriptSource, isNotNull, reason: "script $scriptIndex");
       String actualExternalScriptName = scriptSource.shortName;
       expect(actualExternalScriptName, _expectedExternalScriptName,
           reason: "script $scriptIndex");
     }
   }
 }