Add location information to the JSON reporter.

lib/src/runner/engine.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:collection';
 
 import 'package:async/async.dart' hide Result;
 import 'package:collection/collection.dart';
 import 'package:pool/pool.dart';
@@ skipping 347 matching lines @@
     _restarted.remove(liveTest);
   }
 
   /// Runs a dummy [LiveTest] for a test or group marked as "skip".
   ///
   /// [suiteController] is the controller for the suite that contains [entry].
   /// [parents] is a list of groups that contain [entry].
   Future _runSkippedTest(LiveSuiteController suiteController, GroupEntry entry,
       List<Group> parents) {
     // The netry name will be `null` for the root group.
-    var test = new LocalTest(entry.name ?? "(suite)", entry.metadata, () {});
+    var test = new LocalTest(entry.name ?? "(suite)", entry.metadata, () {},
+        trace: entry.trace);
 
     var controller;
     controller = new LiveTestController(
         suiteController.liveSuite.suite, test, () {
       controller.setState(const State(Status.running, Result.success));
       controller.setState(const State(Status.complete, Result.success));
       controller.completer.complete();
     }, () {}, groups: parents);
 
     return _runLiveTest(suiteController, controller.liveTest);
@@ skipping 101 matching lines @@
     var futures = allLiveTests.map((liveTest) => liveTest.close()).toList();
 
     // Closing the load pool will close the test suites as soon as their tests
     // are done. For browser suites this is effectively immediate since their
     // tests shut down as soon as they're closed, but for VM suites we may need
     // to wait for tearDowns or tearDownAlls to run.
     futures.add(_loadPool.close());
     await Future.wait(futures, eagerError: true);
   }
 }