Implement 'Sort Members' for the new analysis driver.

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/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/edit/edit_domain.dart';
@@ skipping 19 matching lines @@
     super.setUp();
     createProject();
     ExtensionManager manager = new ExtensionManager();
     manager.processPlugins([server.serverPlugin]);
     handler = new EditDomainHandler(server);
   }
 
   test_BAD_doesNotExist() async {
     Request request =
         new EditSortMembersParams('/no/such/file.dart').toRequest('0');
-    Response response = handler.handleRequest(request);
+    Response response = await waitResponse(request);
     expect(response,
         isResponseFailure('0', RequestErrorCode.SORT_MEMBERS_INVALID_FILE));
   }
 
   test_BAD_hasParseError() async {
     addTestFile('''
 main() {
   print()
 }
 ''');
     Request request = new EditSortMembersParams(testFile).toRequest('0');
-    Response response = handler.handleRequest(request);
+    Response response = await waitResponse(request);
     expect(response,
         isResponseFailure('0', RequestErrorCode.SORT_MEMBERS_PARSE_ERRORS));
   }
 
   test_BAD_notDartFile() async {
     Request request =
         new EditSortMembersParams('/not-a-Dart-file.txt').toRequest('0');
-    Response response = handler.handleRequest(request);
+    Response response = await waitResponse(request);
     expect(response,
         isResponseFailure('0', RequestErrorCode.SORT_MEMBERS_INVALID_FILE));
   }
 
   test_OK_afterWaitForAnalysis() async {
     addTestFile('''
 class C {}
 class A {}
 class B {}
 ''');
@@ skipping 114 matching lines @@
 class B {}
 ''');
     return _assertSorted(r'''
 class A {}
 class B {}
 class C {}
 ''');
   }
 
   Future _assertSorted(String expectedCode) async {
-    _requestSort();
+    await _requestSort();
     String resultCode = SourceEdit.applySequence(testCode, fileEdit.edits);
     expect(resultCode, expectedCode);
   }
 
-  void _requestSort() {
+  Future _requestSort() async {
     Request request = new EditSortMembersParams(testFile).toRequest('0');
-    Response response = handleSuccessfulRequest(request);
+    Response response = await waitResponse(request);
     var result = new EditSortMembersResult.fromResponse(response);
     fileEdit = result.edit;
   }
 }