dart:io | Add asynchronous Link.create implementation.

sdk/lib/io/file_impl.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.io;
 
 // Read the file in blocks of size 64k.
 const int _BLOCK_SIZE = 64 * 1024;
 
 
@@ skipping 133 matching lines @@
     } else {
       _resume();
     }
   }
 }
 
 class _FileStreamConsumer extends StreamConsumer<List<int>, File> {
   File _file;
   Future<RandomAccessFile> _openFuture;
   StreamSubscription _subscription;
-  
 
   _FileStreamConsumer(File this._file, FileMode mode) {
     _openFuture = _file.open(mode: mode);
   }
 
   _FileStreamConsumer.fromStdio(int fd) {
     assert(1 <= fd && fd <= 2);
     _openFuture = new Future.immediate(_File._openStdioSync(fd));
   }
 
@@ skipping 48 matching lines @@
 const int _TRUNCATE_REQUEST = 9;
 const int _LENGTH_REQUEST = 10;
 const int _LENGTH_FROM_PATH_REQUEST = 11;
 const int _LAST_MODIFIED_REQUEST = 12;
 const int _FLUSH_REQUEST = 13;
 const int _READ_BYTE_REQUEST = 14;
 const int _WRITE_BYTE_REQUEST = 15;
 const int _READ_REQUEST = 16;
 const int _READ_LIST_REQUEST = 17;
 const int _WRITE_LIST_REQUEST = 18;
-const int _DELETE_LINK_REQUEST = 19;
+const int _CREATE_LINK_REQUEST = 19;
+const int _DELETE_LINK_REQUEST = 20;
 
 // Base class for _File and _RandomAccessFile with shared functions.
 class _FileBase {
   bool _isErrorResponse(response) {
     return response is List && response[0] != _SUCCESS_RESPONSE;
   }
 
   _exceptionFromResponse(response, String message) {
     assert(_isErrorResponse(response));
     switch (response[_ERROR_RESPONSE_ERROR_TYPE]) {
@@ skipping 820 matching lines @@
           new FileIOException("File closed '$_path'"));
     });
     return completer.future;
   }
 
   final String _path;
   int _id;
 
   SendPort _fileService;
 }