Added timeout parameter to RawSocket and Socket connect, which allows for the specification of a ma…

tests/standalone/io/socket_test.dart

 // Copyright (c) 2013, 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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "dart:async";
@@ skipping 179 matching lines @@
         socket.close();
         server.close();
         asyncEnd();
       }, onDone: () {
         Expect.fail("Unexpected pipe completion");
       });
     });
   });
 }
 
+void testConnectTimeout() {
+  asyncStart();
+  Duration timeout = new Duration(milliseconds: 20);
+  Socket.connect("8.8.8.7", 80, timeout: timeout).then((socket) {
+    Expect.fail("Unexpected connection made.");
+    asyncEnd();
+  }).catchError((e) {
+    Expect.isTrue(e is SocketException);
+    asyncEnd();
+  });
+}
+
 main() {
   testArguments();
   testSimpleBind();
   testInvalidBind();
   testConnectImmediateDestroy();
   testConnectConsumerClose();
   testConnectConsumerWriteClose();
   testConnectStreamClose();
   testConnectStreamDataClose(true);
   testConnectStreamDataClose(false);
   testConnectStreamDataCloseCancel(true);
   testConnectStreamDataCloseCancel(false);
+  testConnectTimeout();
 }