Add the ability to whitelist plugins

pkg/analysis_server/test/analysis_abstract.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.
 
 import 'dart:async';
 
 import 'package:analysis_server/protocol/protocol.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart'
     hide AnalysisOptions;
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 347 matching lines @@
   void setAnalysisUpdateContentParams(
       plugin.AnalysisUpdateContentParams params) {
     analysisUpdateContentParams = params;
   }
 
   @override
   Future<List<Null>> stopAll() async {
     fail('Unexpected invocation of stopAll');
     return null;
   }
+
+  @override
+  void whitelistEverything() {
+    fail('Unexpected invocation of whitelistEverything');
+  }
 }