Add setNoDelay method on Socket/RawSocket.

runtime/bin/socket_win.cc

 // 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/builtin.h"
 #include "bin/eventhandler.h"
 #include "bin/file.h"
@@ skipping 292 matching lines @@
 
 bool Socket::SetNonBlocking(intptr_t fd) {
   return SetBlockingHelper(fd, false);
 }
 
 
 bool Socket::SetBlocking(intptr_t fd) {
   return SetBlockingHelper(fd, true);
 }
 
+
+bool Socket::SetNoDelay(intptr_t fd, bool enabled) {
+  SocketHandle* handle = reinterpret_cast<SocketHandle*>(fd);
+  int on = enabled ? 1 : 0;
+  return setsockopt(fd,
+                    IPPROTO_TCP,
+                    TCP_NODELAY,
+                    reinterpret_cast<char *>(&on),
+                    sizeof(on)) == 0;
+}
+
 #endif  // defined(TARGET_OS_WINDOWS)