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

runtime/bin/stream_util.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 _BaseDataInputStream {
   abstract int available();
 
   List<int> read([int len]) {
     if (_closeCallbackCalled) return null;
     int bytesToRead = available();
@@ skipping 13 matching lines @@
 
   int readInto(List<int> buffer, [int offset = 0, int len]) {
     if (_closeCallbackCalled) return null;
     if (len === null) len = buffer.length;
     if (offset < 0) throw new StreamException("Illegal offset $offset");
     if (len < 0) throw new StreamException("Illegal length $len");
     int bytesToRead = Math.min(len, available());
     return _readInto(buffer, offset, bytesToRead);
   }
 
+  void pipe(OutputStream output, [bool close = true]) {
+    _pipe(this, output, close: close);
+  }
+
   bool get closed() => _closeCallbackCalled;
 
   void set dataHandler(void callback()) {
     _clientDataHandler = callback;
     _checkScheduleCallbacks();
   }
 
   void set closeHandler(void callback()) {
     _clientCloseHandler = callback;
     _checkScheduleCallbacks();
@@ skipping 39 matching lines @@
   // from available is now all remaining data. If this is true and the
   // value of available is zero the close handler is called.
   bool _streamMarkedClosed = false;
 
   // When this is set to true the close callback has been called and
   // the stream is fully closed.
   bool _closeCallbackCalled = false;
 
   Timer _scheduledDataCallback;
   Timer _scheduledCloseCallback;
-  var _clientDataHandler;
-  var _clientCloseHandler;
+  Function _clientDataHandler;
+  Function _clientCloseHandler;
 }
 
 
 void _pipe(InputStream input, OutputStream output, [bool close]) {
   Function pipeDataHandler;
   Function pipeCloseHandler;
   Function pipeNoPendingWriteHandler;
 
   Function _inputCloseHandler;
 
@@ skipping 17 matching lines @@
     input.dataHandler = pipeDataHandler;
     output.noPendingWriteHandler = null;
   };
 
   _inputCloseHandler = input._clientCloseHandler;
   input.dataHandler = pipeDataHandler;
   input.closeHandler = pipeCloseHandler;
   output.noPendingWriteHandler = null;
 }