Fixed utf8 encoding/decoding issues in the testing scripts

tools/testing/dart/utils.dart

Index: tools/testing/dart/utils.dart
diff --git a/tools/testing/dart/utils.dart b/tools/testing/dart/utils.dart
new file mode 100644
index 0000000000000000000000000000000000000000..280140c90a51dbdbb5c97ad52d237948159c81dc
--- /dev/null
+++ b/tools/testing/dart/utils.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2013, 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.
+
+library utils;
+
+import 'dart:utf' as utf;
+
+
+List<int> encodeUtf8(String string) {
+  return utf.encodeUtf8(string);
+}
+
+// TODO(kustermann,ricow): As soon we have a debug log we should log
+// invalid utf8-encoded input to the log.
+// Currently invalid bytes will be replaced by a replacement character.
+String decodeUtf8(List<int> bytes) {
+  return utf.decodeUtf8(bytes);
+}
+