Implement list based output stream and add pipe to list based input streams

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 110 matching lines @@
 
 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);
   }
 
-  bool writeFrom(List<int> buffer, [int offset, int len]) {
+  bool writeFrom(List<int> buffer, [int offset = 0, int len]) {
     return _write(
         buffer, offset, (len == null) ? buffer.length - offset : len);
   }
 
   void end() {
     _file.closeSync();
   }
 
   void close() {
     _file.closeSync();
@@ skipping 981 matching lines @@
   var _readByteHandler;
   var _readListHandler;
   var _noPendingWriteHandler;
   var _positionHandler;
   var _setPositionHandler;
   var _truncateHandler;
   var _lengthHandler;
   var _flushHandler;
   var _errorHandler;
 }