- Allow implementations to hook into the Utf8Decoder.convert method.

runtime/lib/convert_patch.dart

 // Copyright (c) 2014, 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:_internal" show POWERS_OF_TEN;
 
 // JSON conversion.
 
 patch _parseJson(String json, reviver(var key, var value)) {
   _BuildJsonListener listener;
@@ skipping 12 matching lines @@
 
 patch class Utf8Decoder {
   /* patch */
   Converter<List<int>, dynamic> fuse(Converter<String, dynamic> next) {
     if (next is JsonDecoder) {
       return new _JsonUtf8Decoder(next._reviver, this._allowMalformed);
     }
     // TODO(lrn): Recognize a fused decoder where the next step is JsonDecoder.
     return super.fuse(next);
   }
+
+  // Allow intercepting of UTF8 decoding when builtin lists are passed.
+  /* patch */
+  static String _convertIntercepted(
+      bool allowMalformed, List<int> codeUnits, int start, int end) {
+    return null;  // This call was not intercepted.
+  }
 }
 
 class _JsonUtf8Decoder extends Converter<List<int>, Object> {
   final _Reviver _reviver;
   final bool _allowMalformed;
 
   _JsonUtf8Decoder(this._reviver, this._allowMalformed);
 
   dynamic convert(List<int> input) {
     var parser = _JsonUtf8DecoderSink._createParser(_reviver, _allowMalformed);
@@ skipping 1711 matching lines @@
     _parser.parse(start);
   }
 
   void close() {
     _parser.close();
     var decoded = _parser.result;
     _sink.add(decoded);
     _sink.close();
   }
 }