Update charted to 0.4.8 and roll

packages/utf/lib/src/shared.dart

Index: packages/utf/lib/src/shared.dart
diff --git a/packages/utf/lib/src/shared.dart b/packages/utf/lib/src/shared.dart
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index 0000000000000000000000000000000000000000..257def32445f4c8cdccca50a8801171b2da14936
--- /dev/null
+++ b/packages/utf/lib/src/shared.dart
@@ -0,0 +1,15 @@
+// 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 'util.dart';
+
+// TODO(jmesserly): would be nice to have this on String (dartbug.com/6501).
+/**
+ * Provide a list of Unicode codepoints for a given string.
+ */
+List<int> stringToCodepoints(String str) {
+  // Note: str.codeUnits gives us 16-bit code units on all Dart implementations.
+  // So we need to convert.
+  return utf16CodeUnitsToCodepoints(str.codeUnits);
+}