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diff --git a/third_party/libwebrtc/rtc_base/proxy_server.h b/third_party/libwebrtc/rtc_base/proxy_server.h
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+++ b/third_party/libwebrtc/rtc_base/proxy_server.h
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+/*
+ *  Copyright 2004 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 RTC_BASE_PROXY_SERVER_H_
+#define RTC_BASE_PROXY_SERVER_H_
+
+#include <memory>
+#include <vector>
+
+#include "absl/memory/memory.h"
+#include "rtc_base/memory/fifo_buffer.h"
+#include "rtc_base/server_socket_adapters.h"
+#include "rtc_base/socket.h"
+#include "rtc_base/socket_address.h"
+
+namespace rtc {
+
+class SocketFactory;
+
+// ProxyServer is a base class that allows for easy construction of proxy
+// servers. With its helper class ProxyBinding, it contains all the necessary
+// logic for receiving and bridging connections. The specific client-server
+// proxy protocol is implemented by an instance of the AsyncProxyServerSocket
+// class; children of ProxyServer implement WrapSocket appropriately to return
+// the correct protocol handler.
+
+class ProxyBinding : public sigslot::has_slots<> {
+ public:
+  ProxyBinding(AsyncProxyServerSocket* in_socket, Socket* out_socket);
+  ~ProxyBinding() override;
+
+  ProxyBinding(const ProxyBinding&) = delete;
+  ProxyBinding& operator=(const ProxyBinding&) = delete;
+
+  sigslot::signal1<ProxyBinding*> SignalDestroyed;
+
+ private:
+  void OnConnectRequest(AsyncProxyServerSocket* socket,
+                        const SocketAddress& addr);
+  void OnInternalRead(Socket* socket);
+  void OnInternalWrite(Socket* socket);
+  void OnInternalClose(Socket* socket, int err);
+  void OnExternalConnect(Socket* socket);
+  void OnExternalRead(Socket* socket);
+  void OnExternalWrite(Socket* socket);
+  void OnExternalClose(Socket* socket, int err);
+
+  static void Read(Socket* socket, FifoBuffer* buffer);
+  static void Write(Socket* socket, FifoBuffer* buffer);
+  void Destroy();
+
+  static const int kBufferSize = 4096;
+  std::unique_ptr<AsyncProxyServerSocket> int_socket_;
+  std::unique_ptr<Socket> ext_socket_;
+  bool connected_;
+  FifoBuffer out_buffer_;
+  FifoBuffer in_buffer_;
+};
+
+class ProxyServer : public sigslot::has_slots<> {
+ public:
+  ProxyServer(SocketFactory* int_factory,
+              const SocketAddress& int_addr,
+              SocketFactory* ext_factory,
+              const SocketAddress& ext_ip);
+  ~ProxyServer() override;
+
+  ProxyServer(const ProxyServer&) = delete;
+  ProxyServer& operator=(const ProxyServer&) = delete;
+
+  // Returns the address to which the proxy server is bound
+  SocketAddress GetServerAddress();
+
+ protected:
+  void OnAcceptEvent(Socket* socket);
+  virtual AsyncProxyServerSocket* WrapSocket(Socket* socket) = 0;
+
+ private:
+  SocketFactory* ext_factory_;
+  SocketAddress ext_ip_;
+  std::unique_ptr<Socket> server_socket_;
+  std::vector<std::unique_ptr<ProxyBinding>> bindings_;
+};
+
+// SocksProxyServer is a simple extension of ProxyServer to implement SOCKS.
+class SocksProxyServer : public ProxyServer {
+ public:
+  SocksProxyServer(SocketFactory* int_factory,
+                   const SocketAddress& int_addr,
+                   SocketFactory* ext_factory,
+                   const SocketAddress& ext_ip)
+      : ProxyServer(int_factory, int_addr, ext_factory, ext_ip) {}
+
+  SocksProxyServer(const SocksProxyServer&) = delete;
+  SocksProxyServer& operator=(const SocksProxyServer&) = delete;
+
+ protected:
+  AsyncProxyServerSocket* WrapSocket(Socket* socket) override;
+};
+
+}  // namespace rtc
+
+#endif  // RTC_BASE_PROXY_SERVER_H_