Enable async support

pkg/analyzer/test/options_test.dart

 // Copyright (c) 2013, 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 options_test;
 
 import 'package:analyzer/options.dart';
 import 'package:unittest/unittest.dart';
 
 main() {
 
   group('AnalyzerOptions.parse()', () {
 
     test('defaults', () {
       CommandLineOptions options =
           CommandLineOptions.parse(['--dart-sdk', '.', 'foo.dart']);
       expect(options, isNotNull);
       expect(options.dartSdkPath, isNotNull);
       expect(options.disableHints, isFalse);
       expect(options.displayVersion, isFalse);
-      expect(options.enableAsync, isFalse);
       expect(options.enableEnum, isFalse);
       expect(options.enableTypeChecks, isFalse);
       expect(options.ignoreUnrecognizedFlags, isFalse);
       expect(options.log, isFalse);
       expect(options.machineFormat, isFalse);
       expect(options.packageRootPath, isNull);
       expect(options.perf, isFalse);
       expect(options.shouldBatch, isFalse);
       expect(options.showPackageWarnings, isFalse);
       expect(options.showSdkWarnings, isFalse);
       expect(options.sourceFiles, equals(['foo.dart']));
       expect(options.warmPerf, isFalse);
       expect(options.warningsAreFatal, isFalse);
     });
 
     test('batch', () {
       CommandLineOptions options =
           CommandLineOptions.parse(['--dart-sdk', '.', '--batch']);
       expect(options.shouldBatch, isTrue);
     });
 
     test('defined variables', () {
       CommandLineOptions options =
           CommandLineOptions.parse(['--dart-sdk', '.', '-Dfoo=bar', 'foo.dart']);
       expect(options.definedVariables['foo'], equals('bar'));
       expect(options.definedVariables['bar'], isNull);
     });
 
-    test('enable async', () {
-      CommandLineOptions options =
-          CommandLineOptions.parse(['--dart-sdk', '.', '--enable-async', 'foo.dart']);
-      expect(options.enableAsync, isTrue);
-    });
-
     test('enable enum', () {
       CommandLineOptions options =
           CommandLineOptions.parse(['--dart-sdk', '.', '--enable-enum', 'foo.dart']);
       expect(options.enableEnum, isTrue);
     });
 
     test('enable type checks', () {
       CommandLineOptions options = CommandLineOptions.parse(
           ['--dart-sdk', '.', '--enable_type_checks', 'foo.dart']);
       expect(options.enableTypeChecks, isTrue);
@@ skipping 64 matching lines @@
 //    test('ignore unrecognized flags', () {
 //      CommandLineOptions options = new CommandLineOptions.parse([
 //        '--ignore_unrecognized_flags', '--bar', '--baz', 'foo.dart']);
 //      expect(options, isNotNull);
 //      expect(options.sourceFiles, equals(['foo.dart']));
 //    });
 
   });
 
 }