Add suite information to the JSON reporter.

lib/src/runner/loader.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.
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 
 import 'package:analyzer/analyzer.dart' hide Configuration;
 import 'package:async/async.dart';
@@ skipping 112 matching lines @@
             new Group.root([], metadata: metadata),
             path: path, platform: platform));
         continue;
       }
 
       var name = (platform.isJS ? "compiling " : "loading ") + path;
       yield new LoadSuite(name, () {
         return platform == TestPlatform.vm
             ? _loadVmFile(path, metadata)
             : _loadBrowserFile(path, platform, metadata);
-      }, platform: platform);
+      }, path: path, platform: platform);
     }
   }
 
   /// Load the test suite at [path] in [platform].
   ///
   /// [metadata] is the suite-level metadata for the test.
   Future<RunnerSuite> _loadBrowserFile(String path, TestPlatform platform,
         Metadata metadata) async =>
       (await _browserServer).loadSuite(path, platform, metadata);
 
@@ skipping 120 matching lines @@
   Future close() {
     return _closeMemo.runOnce(() async {
       await Future.wait(_suites.map((suite) => suite.close()));
       _suites.clear();
 
       if (!_browserServerMemo.hasRun) return;
       await (await _browserServer).close();
     });
   }
 }