Add metadata to messages emitted by live tests.

lib/src/runner/engine.dart

Index: lib/src/runner/engine.dart
diff --git a/lib/src/runner/engine.dart b/lib/src/runner/engine.dart
index e422681c57602fa19a17057e318a78e9b775c3bf..2f3971c9fdc3b27bbb813c2d4b6ec1eff5086b9a 100644
--- a/lib/src/runner/engine.dart
+++ b/lib/src/runner/engine.dart
@@ -14,6 +14,7 @@ import '../backend/group_entry.dart';
 import '../backend/invoker.dart';
 import '../backend/live_test.dart';
 import '../backend/live_test_controller.dart';
+import '../backend/message.dart';
 import '../backend/state.dart';
 import '../backend/test.dart';
 import '../util/iterable_set.dart';
@@ -372,6 +373,12 @@ class Engine {
         suiteController.liveSuite.suite, test, () {
       controller.setState(const State(Status.running, Result.success));
       controller.setState(const State(Status.running, Result.skipped));
+
+      if (entry.metadata.skipReason != null) {
+        controller.message(
+            new Message.skip("Skip: ${entry.metadata.skipReason}"));
+      }
+
       controller.setState(const State(Status.complete, Result.skipped));
       controller.completer.complete();
     }, () {}, groups: parents);