Support serialization of loadLibrary

tests/compiler/dart2js/parser_helper.dart

 // Copyright (c) 2016, 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 parser_helper;
 
 import "package:expect/expect.dart";
 
 import "package:compiler/src/elements/elements.dart";
 import 'package:compiler/src/id_generator.dart';
@@ skipping 52 matching lines @@
     infos.forEach(log);
   }
 
   void reportWarning(
       DiagnosticMessage message,
       [List<DiagnosticMessage> infos = const <DiagnosticMessage>[]]) {
     log(message);
     infos.forEach(log);
   }
 
-  void reportInfo(Spannable node, MessageKind errorCode, [Map arguments]) {
+  void reportInfo(Spannable node, MessageKind errorCode,
+      [Map arguments = const {}]) {

[Johnni Winther, 2016/06/30 11:09:33]

Ditto

     log(new Message(MessageTemplate.TEMPLATES[errorCode], arguments, false));
   }
 
   void reportHint(
       DiagnosticMessage message,
       [List<DiagnosticMessage> infos = const <DiagnosticMessage>[]]) {
     log(message);
     infos.forEach(log);
   }
 
@@ skipping 78 matching lines @@
   reporter.withCurrentElement(unit, () => parser.parseUnit(tokens));
   return unit.localMembers;
 }
 
 NodeList fullParseUnit(String source, {DiagnosticReporter reporter}) {
   return parseBodyCode(
       source,
       (parser, tokens) => parser.parseUnit(tokens),
       reporter: reporter);
 }