Add support code to make fixes easier in plugins

pkg/analysis_server/lib/src/services/correction/fix.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 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/src/services/correction/fix_internal.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/parser.dart';
+import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
 
 /**
  * Return true if this [errorCode] is likely to have a fix associated with it.
  */
 bool hasFix(ErrorCode errorCode) =>
     errorCode == StaticWarningCode.UNDEFINED_CLASS_BOOLEAN ||
     errorCode == StaticWarningCode.CONCRETE_CLASS_WITH_ABSTRACT_MEMBER ||
     errorCode == StaticWarningCode.EXTRA_POSITIONAL_ARGUMENTS ||
     errorCode == StaticWarningCode.EXTRA_POSITIONAL_ARGUMENTS_COULD_BE_NAMED ||
     errorCode == StaticWarningCode.NEW_WITH_UNDEFINED_CONSTRUCTOR ||
@@ skipping 216 matching lines @@
   @override
   final AnalysisError error;
 
   FixContextImpl(this.resourceProvider, this.analysisDriver, this.error);
 
   FixContextImpl.from(FixContext other)
       : resourceProvider = other.resourceProvider,
         analysisDriver = other.analysisDriver,
         error = other.error;
 }