dart:io | Add rename to Link

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 202 matching lines @@
 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 _CREATE_LINK_REQUEST = 19;
 const int _DELETE_LINK_REQUEST = 20;
-const int _LINK_TARGET_REQUEST = 21;
-const int _TYPE_REQUEST = 22;
-const int _IDENTICAL_REQUEST = 23;
-const int _STAT_REQUEST = 24;
+const int _RENAME_LINK_REQUEST = 21;
+const int _LINK_TARGET_REQUEST = 22;
+const int _TYPE_REQUEST = 23;
+const int _IDENTICAL_REQUEST = 24;
+const int _STAT_REQUEST = 25;
 
 // TODO(ager): The only reason for this class is that the patching
 // mechanism doesn't seem to like patching a private top level
 // function.
 class _FileUtils {
   external static SendPort _newServicePort();
 }
 
 // Class for encapsulating the native implementation of files.
 class _File implements File {
@@ skipping 90 matching lines @@
       if (_isErrorResponse(response)) {
         throw _exceptionFromResponse(
             response, "Cannot rename file '$_path' to '$newPath'");
       }
       return new File(newPath);
     });
   }
 
   external static _rename(String oldPath, String newPath);
 
+  external static _renameLink(String oldPath, String newPath);
+
   File renameSync(String newPath) {
     var result = _rename(_path, newPath);
     throwIfError(result, "Cannot rename file '$_path' to '$newPath'");
     return new File(newPath);
   }
 
   Directory get directory {
     Path path = new Path(_path).directoryPath;
     return new Directory.fromPath(path);
   }
@@ skipping 658 matching lines @@
 
   Future _closedException() {
     return new Future.error(new FileException("File closed '$_path'"));
   }
 
   final String _path;
   int _id;
 
   SendPort _fileService;
 }