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diff --git a/net/base/winsock_util.h b/net/base/winsock_util.h
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+++ b/net/base/winsock_util.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_BASE_WINSOCK_UTIL_H_
+#define NET_BASE_WINSOCK_UTIL_H_
+#pragma once
+
+#include <winsock2.h>
+
+namespace net {
+
+// Assert that the (manual-reset) event object is not signaled.
+void AssertEventNotSignaled(WSAEVENT hEvent);
+
+// If the (manual-reset) event object is signaled, resets it and returns true.
+// Otherwise, does nothing and returns false.  Called after a Winsock function
+// succeeds synchronously
+//
+// Our testing shows that except in rare cases (when running inside QEMU),
+// the event object is already signaled at this point, so we call this method
+// to avoid a context switch in common cases.  This is just a performance
+// optimization.  The code still works if this function simply returns false.
+bool ResetEventIfSignaled(WSAEVENT hEvent);
+
+// Map winsock error to Chromium error.
+int MapWinsockError(int os_error);
+
+}  // namespace net
+
+#endif  // NET_BASE_WINSOCK_UTIL_H_