Improve the event handling for string input stream

runtime/bin/chunked_stream.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 _ChunkedInputStream implements ChunkedInputStream {
   _ChunkedInputStream(InputStream this._input, [int chunkSize])
       : _chunkSize = chunkSize, _bufferList = new _BufferList() {
     if (_chunkSize === null) {
       _chunkSize = 0;
     }
@@ skipping 36 matching lines @@
   void set closeHandler(void callback()) {
     _clientCloseHandler = callback;
   }
 
   void _dataHandler() {
     _readData();
     if (_bufferList.length >= _chunkSize && _clientDataHandler !== null) {
       _clientDataHandler();
     }
     _checkScheduleCallback();
+    _checkInstallDataHandler();
   }
 
   void _readData() {
     List<int> data = _input.read();
     if (data !== null) {
       _bufferList.add(data);
     }
   }
 
   void _closeHandler() {
@@ skipping 57 matching lines @@
   InputStream _input;
   _BufferList _bufferList;
   int _chunkSize;
   bool _inputClosed = false;  // Is the underlying input stream closed?
   bool _closed = false;  // Has the close handler been called?.
   Timer _scheduledDataCallback;
   Timer _scheduledCloseCallback;
   Function _clientDataHandler;
   Function _clientCloseHandler;
 }