Add chunked conversion to converters.

tests/lib/convert/chunked_conversion_utf8_test.dart

Index: tests/lib/convert/chunked_conversion_utf8_test.dart
diff --git a/tests/lib/convert/utf8_test.dart b/tests/lib/convert/chunked_conversion_utf8_test.dart
similarity index 83%
copy from tests/lib/convert/utf8_test.dart
copy to tests/lib/convert/chunked_conversion_utf8_test.dart
index 4fa02970df59d891df5c7f068684261bd7ac50ed..9260f85c0dbd444ec6b280092f5269c44a04ed6e 100644
--- a/tests/lib/convert/utf8_test.dart
+++ b/tests/lib/convert/chunked_conversion_utf8_test.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -6,7 +6,15 @@ library utf8_test;
 import "package:expect/expect.dart";
 import 'dart:convert';
 
-String decode(List<int> bytes) => new Utf8Decoder().convert(bytes);
+String decode(List<int> bytes) {
+  StringBuffer buffer = new StringBuffer();
+  ChunkedConversionSink stringSink =
+      new StringConversionSink.fromStringSink(buffer);
+  var byteSink = new Utf8Decoder().startChunkedConversion(stringSink);
+  bytes.forEach((byte) { byteSink.add([byte]); });
+  byteSink.close();
+  return buffer.toString();
+}
 
 main() {
   // Google favorite: "Îñţérñåţîöñåļîžåţîờñ".
@@ -42,6 +50,4 @@ main() {
   Expect.equals(string.length, 2);
   Expect.equals("𐐒".length, 2);
   Expect.stringEquals("𐐒", string);
-
-  // TODO(ahe): Add tests of bad input.
 }