include output unit in constant info

lib/json_info_codec.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.
 
 /// Converters and codecs for converting between JSON and [Info] classes.
 part of dart2js_info.info;
 
 // TODO(sigmund): add unit tests.
 class JsonToAllInfoConverter extends Converter<Map<String, dynamic>, AllInfo> {
   Map<String, Info> registry;
@@ skipping 113 matching lines @@
       ..code = json['code']
       ..isConst = json['const'] ?? false
       ..initializer = parseId(json['initializer'])
       ..closures = (json['children'] as List).map(parseId).toList();
   }
 
   ConstantInfo parseConstant(Map json) {
     ConstantInfo result = parseId(json['id']);
     return result
       ..code = json['code']
-      ..size = json['size'];
+      ..size = json['size']
+      ..outputUnit = parseId(json['outputUnit']);
   }
 
   TypedefInfo parseTypedef(Map json) {
     TypedefInfo result = parseId(json['id']);
     return result
       ..name = json['name']
       ..parent = parseId(json['parent'])
       ..type = json['type']
       ..size = 0;
   }
@@ skipping 108 matching lines @@
   Map _visitDependencyInfo(DependencyInfo info) =>
       {'id': info.target.serializedId, 'mask': info.mask};
 
   Map _visitAllInfoHolding(AllInfo allInfo) {
     var map = <String, List>{};
     void helper(CodeInfo info) {
       if (info.uses.isEmpty) return;
       map[info.serializedId] =
           info.uses.map((u) => _visitDependencyInfo(u)).toList();
     }
+
     allInfo.functions.forEach(helper);
     allInfo.fields.forEach(helper);
     return map;
   }
 
   Map _visitAllInfoDependencies(AllInfo allInfo) {
     var map = <String, List>{};
     allInfo.dependencies.forEach((k, v) {
       map[k.serializedId] = v.map((i) => i.serializedId).toList();
     });
@@ skipping 153 matching lines @@
   visitTypedef(TypedefInfo info) => _visitBasicInfo(info)..['type'] = info.type;
 
   visitOutput(OutputUnitInfo info) =>
       _visitBasicInfo(info)..['imports'] = info.imports;
 }
 
 class AllInfoJsonCodec extends Codec<AllInfo, Map> {
   final Converter<AllInfo, Map> encoder = new AllInfoToJsonConverter();
   final Converter<Map, AllInfo> decoder = new JsonToAllInfoConverter();
 }