Print the data we get back from the tcp socket meta data service

runtime/observatory/tests/service/tcp_socket_service_test.dart

Index: runtime/observatory/tests/service/tcp_socket_service_test.dart
diff --git a/runtime/observatory/tests/service/tcp_socket_service_test.dart b/runtime/observatory/tests/service/tcp_socket_service_test.dart
index f8dff03d4acd382f388b8340500973263b273c29..c80cad5626763c4b298195935c205b3911766dd1 100644
--- a/runtime/observatory/tests/service/tcp_socket_service_test.dart
+++ b/runtime/observatory/tests/service/tcp_socket_service_test.dart
@@ -36,6 +36,9 @@ var tcpTests = [
     //   The server socket accepting connections, on port X
     //   The accepted connection on the client, on port Y
     //   The client connection, on port X
+    if (result['data'].length != 5) {
+      print(result['data']);
+    }
     expect(result['data'].length, equals(5));
     // The first socket will have a name like listening:127.0.0.1:X
     // The second will have a name like 127.0.0.1:Y