Add metadata to messages emitted by live tests.

lib/src/backend/invoker.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 'package:stack_trace/stack_trace.dart';
 
-import '../backend/group.dart';
 import '../frontend/expect.dart';
 import '../runner/load_suite.dart';
 import '../utils.dart';
 import 'closed_exception.dart';
+import 'group.dart';
 import 'live_test.dart';
 import 'live_test_controller.dart';
+import 'message.dart';
 import 'metadata.dart';
 import 'operating_system.dart';
 import 'outstanding_callback_counter.dart';
 import 'state.dart';
 import 'suite.dart';
 import 'test.dart';
 import 'test_platform.dart';
 
 /// A test in this isolate.
 class LocalTest extends Test {
@@ skipping 269 matching lines @@
 
         _controller.completer.complete();
       }, zoneValues: {
         #test.invoker: this,
         // Use the invoker as a key so that multiple invokers can have different
         // outstanding callback counters at once.
         _counterKey: outstandingCallbacksForBody,
         _closableKey: true
       },
           zoneSpecification: new ZoneSpecification(
-              print: (self, parent, zone, line) => _controller.print(line)),
+              print: (self, parent, zone, line) =>
+                  _controller.message(new Message.print(line))),
           onError: _handleError);
     });
   }
 }