Add pipe to input stream

runtime/bin/file_impl.dart

 // Copyright (c) 2011, 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.
 
 class _FileInputStream implements FileInputStream {
   _FileInputStream(File file) {
     _file = file.openSync();
     _length = _file.lengthSync();
     _checkScheduleCallbacks();
   }
@@ skipping 30 matching lines @@
     if (len < 0) throw new StreamException("Illegal length $len");
     int result = _file.readListSync(buffer, offset, len);
     _checkScheduleCallbacks();
     return result;
   }
 
   int available() {
     return _length - _file.positionSync();
   }
 
+  void pipe(OutputStream output, [bool close = true]) {
+    _pipe(this, output, close: close);
+  }
+
   bool closed() => _eof;
 
   void close() {
     _file.closeSync();
     _closed = true;
   }
 
   void set dataHandler(void callback()) {
     _clientDataHandler = callback;
     _checkScheduleCallbacks();
@@ skipping 42 matching lines @@
       }
     }
   }
 
   RandomAccessFile _file;
   int _length;
   bool _eof = false;
   bool _closed = false;
   Timer _scheduledDataCallback;
   Timer _scheduledCloseCallback;
-  var _clientDataHandler;
-  var _clientCloseHandler;
+  Function _clientDataHandler;
+  Function _clientCloseHandler;
 }
 
 
 class _FileOutputStream implements FileOutputStream {
   _FileOutputStream(File file) {
     _file = file.openSync(true);
   }
 
   bool write(List<int> buffer, [bool copyBuffer = false]) {
     return _write(buffer, 0, buffer.length);
@@ skipping 994 matching lines @@
   var _readByteHandler;
   var _readListHandler;
   var _noPendingWriteHandler;
   var _positionHandler;
   var _setPositionHandler;
   var _truncateHandler;
   var _lengthHandler;
   var _flushHandler;
   var _errorHandler;
 }