Add names and support for preserialized data to serialization tests

tests/compiler/dart2js/serialization/resolved_ast_test.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 dart2js.serialization_resolved_ast_test;
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/compiler.dart';
@@ skipping 11 matching lines @@
   asyncTest(() async {
     SerializedData serializedData =
         await serializeDartCore(arguments: arguments);
     if (arguments.filename != null) {
       Uri entryPoint = Uri.base.resolve(nativeToUriPath(arguments.filename));
       await check(serializedData, entryPoint);
     } else {
       Uri entryPoint = Uri.parse('memory:main.dart');
       // TODO(johnniwinther): Change to test all serialized resolved ast instead
       // only those used in the test.
-      Test test = TESTS.last;
+      Test test = TESTS.first;
       await check(serializedData, entryPoint, test.sourceFiles);
     }
   });
 }
 
 Future check(
   SerializedData serializedData,
   Uri entryPoint,
   [Map<String, String> sourceFiles = const <String, String>{}]) async {
 
@@ skipping 41 matching lines @@
 
   if (resolvedAst1 == null || resolvedAst2 == null) return;
 
   if (verbose) {
     print('Checking resolved asts for $member1 vs $member2');
   }
 
   testResolvedAstEquivalence(
       resolvedAst1, resolvedAst2, const CheckStrategy());
 }