Store and serialize NativeBehavior in TreeElements.

pkg/compiler/lib/src/serialization/keys.dart

 // Copyright (c) 2015, 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 dart2js.serialization.keys;
 
 /// Keys used for serialization.
 class Key {
   static const Key ALIAS = const Key('alias');
   static const Key ARGUMENTS = const Key('arguments');
@@ skipping 66 matching lines @@
   static const Key LISTS = const Key('lists');
   static const Key MAPS = const Key('maps');
   static const Key MEMBERS = const Key('members');
   static const Key MIXIN = const Key('mixin');
   static const Key MIXINS = const Key('mixins');
   static const Key NAME = const Key('name');
   static const Key NAMES = const Key('names');
   static const Key NAMED_ARGUMENTS = const Key('named-arguments');
   static const Key NAMED_PARAMETERS = const Key('named-parameters');
   static const Key NAMED_PARAMETER_TYPES = const Key('named-parameter-types');
+  static const Key NATIVE = const Key('native');
   static const Key NESTING_LEVEL = const Key('nestingLevel');
   static const Key NEW_STRUCTURE = const Key('newStructure');
   static const Key NODE = const Key('node');
   static const Key OFFSET = const Key('offset');
   static const Key OPERATOR = const Key('operator');
   static const Key OPTIONAL_PARAMETER_TYPES =
       const Key('optional-parameter-types');
   static const Key PARAMETERS = const Key('parameters');
   static const Key PARAMETER_TYPES = const Key('parameter-types');
   static const Key PREFIX = const Key('prefix');
@@ skipping 20 matching lines @@
   static const Key URI = const Key('uri');
   static const Key VALUE = const Key('value');
   static const Key VALUES = const Key('values');
 
   final String name;
 
   const Key(this.name);
 
   String toString() => name;
 }