Add assist to convert part-of directives

pkg/analysis_server/lib/src/services/correction/assist.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/assist/assist_core.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer_plugin/utilities/assist/assist.dart';
 
 /**
@@ skipping 43 matching lines @@
   static const CONVERT_INTO_FOR_INDEX = const AssistKind(
       'CONVERT_INTO_FOR_INDEX', 30, "Convert into for-index loop");
   static const CONVERT_INTO_FINAL_FIELD = const AssistKind(
       'CONVERT_INTO_FINAL_FIELD', 30, "Convert into final field");
   static const CONVERT_INTO_GETTER =
       const AssistKind('CONVERT_INTO_GETTER', 30, "Convert into getter");
   static const CONVERT_INTO_IS_NOT =
       const AssistKind('CONVERT_INTO_IS_NOT', 30, "Convert into is!");
   static const CONVERT_INTO_IS_NOT_EMPTY = const AssistKind(
       'CONVERT_INTO_IS_NOT_EMPTY', 30, "Convert into 'isNotEmpty'");
+  static const CONVERT_PART_OF_TO_URI =
+      const AssistKind('CONVERT_PART_OF_TO_URI', 30, "Convert to use a URI");
   static const CONVERT_TO_FIELD_PARAMETER = const AssistKind(
       'CONVERT_TO_FIELD_PARAMETER', 30, "Convert to field formal parameter");
   static const CONVERT_TO_NORMAL_PARAMETER = const AssistKind(
       'CONVERT_TO_NORMAL_PARAMETER', 30, "Convert to normal parameter");
   static const ENCAPSULATE_FIELD =
       const AssistKind('ENCAPSULATE_FIELD', 30, "Encapsulate field");
   static const EXCHANGE_OPERANDS =
       const AssistKind('EXCHANGE_OPERANDS', 30, "Exchange operands");
   static const EXTRACT_CLASS =
       const AssistKind('EXTRACT_CLASS', 30, "Extract class into file '{0}'");
@@ skipping 41 matching lines @@
       const AssistKind('SURROUND_WITH_FOR_IN', 30, "Surround with 'for-in'");
   static const SURROUND_WITH_IF =
       const AssistKind('SURROUND_WITH_IF', 30, "Surround with 'if'");
   static const SURROUND_WITH_TRY_CATCH = const AssistKind(
       'SURROUND_WITH_TRY_CATCH', 30, "Surround with 'try-catch'");
   static const SURROUND_WITH_TRY_FINALLY = const AssistKind(
       'SURROUND_WITH_TRY_FINALLY', 30, "Surround with 'try-finally'");
   static const SURROUND_WITH_WHILE =
       const AssistKind('SURROUND_WITH_WHILE', 30, "Surround with 'while'");
 }