Introduce class Sink<T>.

sdk/lib/convert/ascii.dart

 // 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.
 
 part of dart.convert;
 
 /**
  * An instance of the default implementation of the [AsciiCodec].
  *
  * This instance provides a convenient access to the most common ASCII
@@ skipping 75 matching lines @@
     }
     return result;
   }
 
   /**
    * Starts a chunked conversion.
    *
    * The converter works more efficiently if the given [sink] is a
    * [ByteConversionSink].
    */
-  StringConversionSink startChunkedConversion(
-      ChunkedConversionSink<List<int>> sink) {
+  StringConversionSink startChunkedConversion(Sink<List<int>> sink) {
     if (sink is! ByteConversionSink) {
       sink = new ByteConversionSink.from(sink);
     }
     return new _UnicodeSubsetEncoderSink(_subsetMask, sink);
   }
 
   // Override the base-class' bind, to provide a better type.
   Stream<List<int>> bind(Stream<String> stream) => super.bind(stream);
 }
 
@@ skipping 89 matching lines @@
     }
     return buffer.toString();
   }
 
   /**
    * Starts a chunked conversion.
    *
    * The converter works more efficiently if the given [sink] is a
    * [StringConversionSink].
    */
-  ByteConversionSink startChunkedConversion(
-      ChunkedConversionSink<String> sink) {
+  ByteConversionSink startChunkedConversion(Sink<String> sink) {
     StringConversionSink stringSink;
     if (sink is StringConversionSink) {
       stringSink = sink;
     } else {
       stringSink = new StringConversionSink.from(sink);
     }
     // TODO(lrn): Use stringSink.asUtf16Sink() if it becomes available.
     return new _Latin1DecoderSink(_allowInvalid, stringSink);
   }
 
   // Override the base-class's bind, to provide a better type.
   Stream<String> bind(Stream<List<int>> stream) => super.bind(stream);
 }
 
 class AsciiDecoder extends _UnicodeSubsetDecoder {
   const AsciiDecoder({bool allowInvalid: false})
       : super(allowInvalid, _ASCII_MASK);
 
   /**
    * Starts a chunked conversion.
    *
    * The converter works more efficiently if the given [sink] is a
    * [StringConversionSink].
    */
-  ByteConversionSink startChunkedConversion(
-      ChunkedConversionSink<String> sink) {
+  ByteConversionSink startChunkedConversion(Sink<String> sink) {
     StringConversionSink stringSink;
     if (sink is StringConversionSink) {
       stringSink = sink;
     } else {
       stringSink = new StringConversionSink.from(sink);
     }
     // TODO(lrn): Use asUtf16Sink when it becomes available. It
     // works just as well, is likely to have less decoding overhead,
     // and make adding U+FFFD easier.
     // At that time, merge this with _Latin1DecoderSink;
@@ skipping 33 matching lines @@
         }
       }
     }
     if (start < end) {
       _utf8Sink.addSlice(source, start, end, isLast);
     } else if (isLast) {
       close();
     }
   }
 }