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diff --git a/third_party/libwebrtc/api/async_resolver_factory.h b/third_party/libwebrtc/api/async_resolver_factory.h
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+/*
+ *  Copyright 2018 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_ASYNC_RESOLVER_FACTORY_H_
+#define API_ASYNC_RESOLVER_FACTORY_H_
+
+#include "rtc_base/async_resolver_interface.h"
+
+namespace webrtc {
+
+// An abstract factory for creating AsyncResolverInterfaces. This allows
+// client applications to provide WebRTC with their own mechanism for
+// performing DNS resolution.
+class AsyncResolverFactory {
+ public:
+  AsyncResolverFactory() = default;
+  virtual ~AsyncResolverFactory() = default;
+
+  // The caller should call Destroy on the returned object to delete it.
+  virtual rtc::AsyncResolverInterface* Create() = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_ASYNC_RESOLVER_FACTORY_H_