Split serialization tests further

tests/compiler/dart2js/serialization/analysis_test_helper.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_analysis_test;
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/filenames.dart';
 import '../memory_compiler.dart';
 import 'helper.dart';
 import 'test_data.dart';
 
+/// Number of tests that are not part of the automatic test grouping.
+int SKIP_COUNT = 0;
+
+/// Number of groups that the [TESTS] are split into.
+int SPLIT_COUNT = 2;
+
 main(List<String> args) {
   asyncTest(() async {
     Arguments arguments = new Arguments.from(args);
     SerializedData serializedData =
         await serializeDartCore(arguments: arguments);
     if (arguments.filename != null) {
       Uri entryPoint = Uri.base.resolve(nativeToUriPath(arguments.filename));
       await analyze(entryPoint,
           resolutionInputs: serializedData.toUris(),
           sourceFiles: serializedData.toMemorySourceFiles());
@@ skipping 30 matching lines @@
           diagnosticCollector.warnings.length,
           "Unexpected warning count.");
       Expect.equals(test.expectedHintCount, diagnosticCollector.hints.length,
           "Unexpected hint count.");
       Expect.equals(test.expectedInfoCount, diagnosticCollector.infos.length,
           "Unexpected info count.");
     }
   });
 }