Update charted to 0.4.8 and roll

packages/cli_util/lib/src/utils.dart

Index: packages/cli_util/lib/src/utils.dart
diff --git a/packages/cli_util/lib/src/utils.dart b/packages/cli_util/lib/src/utils.dart
new file mode 100644
index 0000000000000000000000000000000000000000..66bab2f99948857b5038eb11f3d464a8853ec80b
--- /dev/null
+++ b/packages/cli_util/lib/src/utils.dart
@@ -0,0 +1,10 @@
+// Copyright (c) 2017, 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:io';
+
+import 'package:path/path.dart' as path;
+
+bool isSdkDir(Directory dir) =>
+    FileSystemEntity.isFileSync(path.join(dir.path, 'version'));