(TBR) update test to run with new task model

pkg/analysis_server/test/services/completion/completion_computer_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 test.services.completion.suggestion;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 95 matching lines @@
           resolveLibrary();
           break;
         default:
           fail('unexpected');
       }
     }, onDone: () {
       done = true;
       // There is only one notification
       expect(count, equals(1));
     });
-    return pumpEventQueue().then((_) {
+    return pumpEventQueue(150).then((_) {
       expect(done, isTrue);
     });
   }
 
   test_compute_fastOnly() {
     contributor1 = new MockCompletionContributor(suggestion1, null);
     contributor2 = new MockCompletionContributor(suggestion2, null);
     manager.contributors = [contributor1, contributor2];
     int count = 0;
     bool done = false;
@@ skipping 71 matching lines @@
   @override
   Future<bool> computeFull(DartCompletionRequest request) {
     this.request = request;
     fullCount++;
     if (fullSuggestion != null) {
       request.addSuggestion(fullSuggestion);
     }
     return new Future.value(fullSuggestion != null);
   }
 }