Enable async support

pkg/analyzer/test/generated/resolver_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.
 
 library engine.resolver_test;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 360 matching lines @@
  * Instances of the class `AnalysisContextForTests` implement an analysis context that has a
  * fake SDK that is much smaller and faster for testing purposes.
  */
 class AnalysisContextForTests extends AnalysisContextImpl {
   @override
   void set analysisOptions(AnalysisOptions options) {
     AnalysisOptions currentOptions = analysisOptions;
     bool needsRecompute =
         currentOptions.analyzeFunctionBodies != options.analyzeFunctionBodies ||
         currentOptions.generateSdkErrors != options.generateSdkErrors ||
-        currentOptions.enableAsync != options.enableAsync ||
         currentOptions.enableDeferredLoading != options.enableDeferredLoading ||
         currentOptions.enableEnum != options.enableEnum ||
         currentOptions.dart2jsHint != options.dart2jsHint ||
         (currentOptions.hint && !options.hint) ||
         currentOptions.preserveComments != options.preserveComments;
     if (needsRecompute) {
       fail(
           "Cannot set options that cause the sources to be reanalyzed in a test context");
     }
     super.analysisOptions = options;
@@ skipping 7431 matching lines @@
    */
   void reset() {
     analysisContext2 = AnalysisContextFactory.contextWithCore();
     // These defaults are duplicated for the editor in
     // editor/tools/plugins/com.google.dart.tools.core/.options .
     AnalysisEngine.instance.enableUnionTypes = false;
     AnalysisEngine.instance.strictUnionTypes = false;
   }
 
   /**
-   * Reset the analysis context to have the 'enableAsync' option set to true.
-   */
-  void resetWithAsync() {
-    AnalysisOptionsImpl options = new AnalysisOptionsImpl();
-    options.enableAsync = true;
-    analysisContext2 =
-        AnalysisContextFactory.contextWithCoreAndOptions(options);
-  }
-
-  /**
    * Reset the analysis context to have the 'enableEnum' option set to true.
    */
   void resetWithEnum() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
   }
 
   /**
    * Reset the analysis context to have the given options applied.
@@ skipping 5976 matching lines @@
         // check propagated type
         FunctionType propagatedType = node.propagatedType as FunctionType;
         expect(propagatedType.returnType, test.typeProvider.stringType);
       } on AnalysisException catch (e, stackTrace) {
         thrownException[0] = new CaughtException(e, stackTrace);
       }
     }
     return null;
   }
 }