add a JsonInfoCodec class

bin/inference/client.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.
 
 /// Client component to display [GlobalResult]s as a web app.
 library dart2js_info.bin.inference.client;
 
 import 'dart:html' hide Entry;
 import 'dart:convert';
 import 'package:dart2js_info/info.dart';
 import 'package:dart2js_info/src/string_edit_buffer.dart';
 import 'package:charcode/charcode.dart';
 
 AllInfo data;
 main() async {
-  data =
-      new AllInfo.fromJson(JSON.decode(await HttpRequest.getString('/data')));
+  data = new AllInfoJsonCodec()
+      .decode(JSON.decode(await HttpRequest.getString('/data')));
 
   routeByHash();
   window.onHashChange.listen((_) => routeByHash());
 }
 
 /// Does basic routing for the client UI.
 routeByHash() {
   var hash = window.location.hash;
   if (hash.isEmpty || hash == '#' || hash == '#!') {
     handleHomePage();
@@ skipping 97 matching lines @@
       for (var entry in entries[metric]) {
         code.insert(entry.begin, '<span class="send ${cssClassName} inactive">',
             -entry.end);
         code.insert(entry.end, '</span>');
       }
     }
   }
 }
 
 _classNameForMetric(Metric metric) => metric.name.replaceAll(' ', '-');