String encoding utility methods and tests for Unicode, UTF-8, -16 and -32.

utils/string_encoding/Utf8.dart

Index: utils/string_encoding/Utf8.dart
diff --git a/utils/string_encoding/Utf8.dart b/utils/string_encoding/Utf8.dart
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+++ b/utils/string_encoding/Utf8.dart
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+// Copyright (c) 2011, 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("UTF8");
+#import("UnicodeCore.dart");
+#import("Unicode.dart");
+#source("Utf8_impl.dart");