Create a public API for contributing fixes and make fixes pluggable

pkg/analysis_server/test/edit/sort_members_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.edit.sort_members;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/edit/edit_domain.dart';
+import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/protocol.dart';
+import 'package:analyzer/src/plugin/plugin_impl.dart';
 import 'package:unittest/unittest.dart' hide ERROR;
 
 import '../analysis_abstract.dart';
 import '../mocks.dart';
 import '../reflective_tests.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(SortMembersTest);
 }
 
 @reflectiveTest
 class SortMembersTest extends AbstractAnalysisTest {
   SourceFileEdit fileEdit;
 
   @override
   void setUp() {
     super.setUp();
     createProject();
-    handler = new EditDomainHandler(server);
+    ExtensionManager manager = new ExtensionManager();
+    ServerPlugin plugin = new ServerPlugin();
+    manager.processPlugins([plugin]);
+    handler = new EditDomainHandler(server, plugin);
   }
 
   Future test_BAD_doesNotExist() {
     return waitForTasksFinished().then((_) {
       Request request =
           new EditSortMembersParams('/no/such/file.dart').toRequest('0');
       Response response = handler.handleRequest(request);
       expect(response,
           isResponseFailure('0', RequestErrorCode.SORT_MEMBERS_INVALID_FILE));
     });
@@ skipping 112 matching lines @@
     });
   }
 
   void _requestSort() {
     Request request = new EditSortMembersParams(testFile).toRequest('0');
     Response response = handleSuccessfulRequest(request);
     var result = new EditSortMembersResult.fromResponse(response);
     fileEdit = result.edit;
   }
 }