Split off the DNS reload timer

net/base/dns_reload_timer.h

+// Copyright (c) 2009 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_DNS_RELOAD_TIMER_H_
+#define NET_BASE_DNS_RELOAD_TIMER_H_
+#pragma once
+
+#include "build/build_config.h"
+
+#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD)
+namespace net {
+
+// DnsReloadTimerExpired tests the thread local DNS reload timer and, if it has
+// expired, returns true and resets the timer. See comments in
+// host_resolver_proc.cc for details.
+bool DnsReloadTimerHasExpired();
+
+}  // namespace net
+#endif
+
+#endif  // NET_BASE_DNS_RELOAD_TIMER_H_