Introduce convenience methods into generated analysis server classes.

pkg/analysis_server/test/services/correction/assist_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.assist;
 
+import 'package:analysis_server/src/protocol2.dart' show SourceEdit;
 import 'package:analysis_server/src/services/correction/assist.dart';
 import 'package:analysis_server/src/services/correction/change.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_single_unit.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
 
@@ skipping 19 matching lines @@
   /**
    * Asserts that there is an [Assist] of the given [kind] at [offset] which
    * produces the [expected] code when applied to [testCode].
    */
   void assertHasAssist(AssistKind kind, String expected) {
     assist = _assertHasAssist(kind);
     change = assist.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);
   }
 
   /**
    * Calls [assertHasAssist] at the offset of [offsetSearch] in [testCode].
    */
   void assertHasAssistAt(String offsetSearch, AssistKind kind,
       String expected) {
     offset = findOffset(offsetSearch);
@@ skipping 2151 matching lines @@
   void _indexTestUnit(String code) {
     resolveTestUnit(code);
     index.indexUnit(context, testUnit);
   }
 
   void _setStartEndSelection() {
     offset = findOffset('// start\n') + '// start\n'.length;
     length = findOffset('// end') - offset;
   }
 }