Fix errors caused by missing argument checking

runtime/bin/socket_impl.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 _SocketBase extends NativeFieldWrapperClass1 {
   // Bit flags used when communicating between the eventhandler and
   // dart code. The EVENT flags are used to indicate events of
   // interest when sending a message from dart code to the
   // eventhandler. When receiving a message from the eventhandler the
@@ skipping 373 matching lines @@
       }
       return result;
     }
     throw new
         SocketIOException("Error: readList failed - invalid socket handle");
   }
 
   _readList(List<int> buffer, int offset, int bytes) native "Socket_ReadList";
 
   int writeList(List<int> buffer, int offset, int bytes) {
+    if (buffer is! List || offset is! int || bytes is! int) {
+      throw new ArgumentError(
+          "Invalid arguments to writeList on Socket");
+    }
     if (!_closed) {
       if (bytes == 0) {
         return 0;
       }
       if (offset < 0) {
         throw new IndexOutOfRangeException(offset);
       }
       if (bytes < 0) {
         throw new IndexOutOfRangeException(bytes);
       }
@@ skipping 163 matching lines @@
   bool _seenFirstOutEvent = false;
   bool _pipe = false;
   Function _clientConnectHandler;
   Function _clientWriteHandler;
   SocketInputStream _inputStream;
   SocketOutputStream _outputStream;
   String _remoteHost;
   int _remotePort;
   static SendPort _socketService;
 }