Introduce convenience methods into generated analysis server classes.

pkg/analysis_server/test/services/correction/fix_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.correction.fix;
 
+import 'package:analysis_server/src/protocol2.dart' show SourceEdit;
 import 'package:analysis_server/src/services/correction/change.dart';
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
 import 'package:analysis_server/src/services/search/search_engine_internal.dart';
 import 'package:analysis_testing/abstract_context.dart';
 import 'package:analysis_testing/abstract_single_unit.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
@@ skipping 17 matching lines @@
   Change change;
   String resultCode;
 
   void assertHasFix(FixKind kind, String expected) {
     AnalysisError error = _findErrorToFix();
     fix = _assertHasFix(kind, error);
     change = fix.change;
     // apply to "file"
     List<FileEdit> fileEdits = change.fileEdits;
     expect(fileEdits, hasLength(1));
-    resultCode = applySequence(testCode, change.fileEdits[0].edits);
+    resultCode = SourceEdit.applySequence(testCode, change.fileEdits[0].edits);
     // verify
     expect(resultCode, expected);
   }
 
   void assertNoFix(FixKind kind) {
     AnalysisError error = _findErrorToFix();
     List<Fix> fixes = computeFixes(searchEngine, testUnit, error);
     for (Fix fix in fixes) {
       if (fix.kind == kind) {
         throw fail('Unexpected fix $kind in\n${fixes.join('\n')}');
@@ skipping 1791 matching lines @@
       positions.add(new Position(testFile, offset));
     }
     return positions;
   }
 
   void _indexTestUnit(String code) {
     resolveTestUnit(code);
     index.indexUnit(context, testUnit);
   }
 }