Add error handling to socket streams

runtime/bin/stream_util.dart

 // Copyright (c) 2012, 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 35 matching lines @@
   void set onData(void callback()) {
     _clientDataHandler = callback;
     _checkScheduleCallbacks();
   }
 
   void set onClosed(void callback()) {
     _clientCloseHandler = callback;
     _checkScheduleCallbacks();
   }
 
-  void set onError(void callback()) {
+  void set onError(void callback(Exception e)) {
     _clientErrorHandler = callback;
   }
 
   abstract List<int> _read(int bytesToRead);
 
   void _dataReceived() {
     // More data has been received asynchronously. Perform the data
     // handler callback now.
     _cancelScheduledDataCallback();
     if (_clientDataHandler !== null) {
@@ skipping 113 matching lines @@
   bool writeString(String string, [Encoding encoding = Encoding.UTF_8]) {
     if (string.length > 0) {
       // Encode and write data.
       _StringEncoder encoder = _StringEncoders.encoder(encoding);
       List<int> data = encoder.encodeString(string);
       return write(data, copyBuffer: false);
     }
     return true;
   }
 }