Add a new kind of suite to ease test.dart integration.

pkg/testing/lib/src/chain.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.md file.
 
 library testing.chain;
 
 import 'dart:async' show
     Future,
     Stream;
 
@@ skipping 52 matching lines @@
   final List<RegExp> pattern;
 
   final List<RegExp> exclude;
 
   final bool processMultitests;
 
   Chain(String name, String kind, this.source, this.uri, Uri statusFile,
       this.pattern, this.exclude, this.processMultitests)
       : super(name, kind, statusFile);
 
-  factory Chain.fromJsonMap(
-      Uri base, Map json, String name, String kind) {
+  factory Chain.fromJsonMap(Uri base, Map json, String name, String kind) {
     Uri source = base.resolve(json["source"]);
     Uri uri = base.resolve(json["path"]);
     Uri statusFile = base.resolve(json["status"]);
     List<RegExp> pattern = new List<RegExp>.from(
         json["pattern"].map((String p) => new RegExp(p)));
     List<RegExp> exclude = new List<RegExp>.from(
         json["exclude"].map((String p) => new RegExp(p)));
     bool processMultitests = json["process-multitests"] ?? false;
-    return new Chain(
-        name, kind, source, uri, statusFile, pattern, exclude, processMultitests);
+    return new Chain(name, kind, source, uri, statusFile, pattern, exclude,
+        processMultitests);
   }
 
   void writeImportOn(StringSink sink) {
     sink.write("import '");
     sink.write(source);
     sink.write("' as ");
     sink.write(name);
     sink.writeln(";");
   }
 
@@ skipping 260 matching lines @@
 Future<Null> runChain(
     CreateContext f, Map<String, String> environment, Set<String> selectors,
     String json) {
   return withErrorHandling(() async {
     Chain suite = new Suite.fromJsonMap(Uri.base, JSON.decode(json));
     print("Running ${suite.name}");
     ChainContext context = await f(suite, environment);
     return context.run(suite, selectors);
   });
 }