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diff --git a/third_party/libwebrtc/p2p/base/tcp_port.h b/third_party/libwebrtc/p2p/base/tcp_port.h
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+++ b/third_party/libwebrtc/p2p/base/tcp_port.h
@@ -0,0 +1,203 @@
+/*
+ *  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 P2P_BASE_TCP_PORT_H_
+#define P2P_BASE_TCP_PORT_H_
+
+#include <list>
+#include <memory>
+#include <string>
+
+#include "absl/memory/memory.h"
+#include "absl/strings/string_view.h"
+#include "api/task_queue/pending_task_safety_flag.h"
+#include "p2p/base/connection.h"
+#include "p2p/base/port.h"
+#include "rtc_base/async_packet_socket.h"
+#include "rtc_base/containers/flat_map.h"
+
+namespace cricket {
+
+class TCPConnection;
+
+// Communicates using a local TCP port.
+//
+// This class is designed to allow subclasses to take advantage of the
+// connection management provided by this class.  A subclass should take of all
+// packet sending and preparation, but when a packet is received, it should
+// call this TCPPort::OnReadPacket (3 arg) to dispatch to a connection.
+class TCPPort : public Port {
+ public:
+  static std::unique_ptr<TCPPort> Create(
+      rtc::Thread* thread,
+      rtc::PacketSocketFactory* factory,
+      const rtc::Network* network,
+      uint16_t min_port,
+      uint16_t max_port,
+      absl::string_view username,
+      absl::string_view password,
+      bool allow_listen,
+      const webrtc::FieldTrialsView* field_trials = nullptr) {
+    // Using `new` to access a non-public constructor.
+    return absl::WrapUnique(new TCPPort(thread, factory, network, min_port,
+                                        max_port, username, password,
+                                        allow_listen, field_trials));
+  }
+  ~TCPPort() override;
+
+  Connection* CreateConnection(const Candidate& address,
+                               CandidateOrigin origin) override;
+
+  void PrepareAddress() override;
+
+  // Options apply to accepted sockets.
+  // TODO(bugs.webrtc.org/13065): Apply also to outgoing and existing
+  // connections.
+  int GetOption(rtc::Socket::Option opt, int* value) override;
+  int SetOption(rtc::Socket::Option opt, int value) override;
+  int GetError() override;
+  bool SupportsProtocol(absl::string_view protocol) const override;
+  ProtocolType GetProtocol() const override;
+
+ protected:
+  TCPPort(rtc::Thread* thread,
+          rtc::PacketSocketFactory* factory,
+          const rtc::Network* network,
+          uint16_t min_port,
+          uint16_t max_port,
+          absl::string_view username,
+          absl::string_view password,
+          bool allow_listen,
+          const webrtc::FieldTrialsView* field_trials);
+
+  // Handles sending using the local TCP socket.
+  int SendTo(const void* data,
+             size_t size,
+             const rtc::SocketAddress& addr,
+             const rtc::PacketOptions& options,
+             bool payload) override;
+
+  // Accepts incoming TCP connection.
+  void OnNewConnection(rtc::AsyncListenSocket* socket,
+                       rtc::AsyncPacketSocket* new_socket);
+
+ private:
+  struct Incoming {
+    rtc::SocketAddress addr;
+    rtc::AsyncPacketSocket* socket;
+  };
+
+  void TryCreateServerSocket();
+
+  rtc::AsyncPacketSocket* GetIncoming(const rtc::SocketAddress& addr,
+                                      bool remove = false);
+
+  // Receives packet signal from the local TCP Socket.
+  void OnReadPacket(rtc::AsyncPacketSocket* socket,
+                    const char* data,
+                    size_t size,
+                    const rtc::SocketAddress& remote_addr,
+                    const int64_t& packet_time_us);
+
+  void OnSentPacket(rtc::AsyncPacketSocket* socket,
+                    const rtc::SentPacket& sent_packet) override;
+
+  void OnReadyToSend(rtc::AsyncPacketSocket* socket);
+
+  bool allow_listen_;
+  std::unique_ptr<rtc::AsyncListenSocket> listen_socket_;
+  // Options to be applied to accepted sockets.
+  // TODO(bugs.webrtc:13065): Configure connect/accept in the same way, but
+  // currently, setting OPT_NODELAY for client sockets is done (unconditionally)
+  // by BasicPacketSocketFactory::CreateClientTcpSocket.
+  webrtc::flat_map<rtc::Socket::Option, int> socket_options_;
+
+  int error_;
+  std::list<Incoming> incoming_;
+
+  friend class TCPConnection;
+};
+
+class TCPConnection : public Connection, public sigslot::has_slots<> {
+ public:
+  // Connection is outgoing unless socket is specified
+  TCPConnection(rtc::WeakPtr<Port> tcp_port,
+                const Candidate& candidate,
+                rtc::AsyncPacketSocket* socket = nullptr);
+  ~TCPConnection() override;
+
+  int Send(const void* data,
+           size_t size,
+           const rtc::PacketOptions& options) override;
+  int GetError() override;
+
+  rtc::AsyncPacketSocket* socket() { return socket_.get(); }
+
+  // Allow test cases to overwrite the default timeout period.
+  int reconnection_timeout() const { return reconnection_timeout_; }
+  void set_reconnection_timeout(int timeout_in_ms) {
+    reconnection_timeout_ = timeout_in_ms;
+  }
+
+ protected:
+  // Set waiting_for_stun_binding_complete_ to false to allow data packets in
+  // addition to what Port::OnConnectionRequestResponse does.
+  void OnConnectionRequestResponse(StunRequest* req,
+                                   StunMessage* response) override;
+
+ private:
+  // Helper function to handle the case when Ping or Send fails with error
+  // related to socket close.
+  void MaybeReconnect();
+
+  void CreateOutgoingTcpSocket();
+
+  void ConnectSocketSignals(rtc::AsyncPacketSocket* socket);
+
+  void OnConnect(rtc::AsyncPacketSocket* socket);
+  void OnClose(rtc::AsyncPacketSocket* socket, int error);
+  void OnReadPacket(rtc::AsyncPacketSocket* socket,
+                    const char* data,
+                    size_t size,
+                    const rtc::SocketAddress& remote_addr,
+                    const int64_t& packet_time_us);
+  void OnReadyToSend(rtc::AsyncPacketSocket* socket);
+
+  TCPPort* tcp_port() {
+    RTC_DCHECK_EQ(port()->GetProtocol(), PROTO_TCP);
+    return static_cast<TCPPort*>(port());
+  }
+
+  std::unique_ptr<rtc::AsyncPacketSocket> socket_;
+  int error_;
+  bool outgoing_;
+
+  // Guard against multiple outgoing tcp connection during a reconnect.
+  bool connection_pending_;
+
+  // Guard against data packets sent when we reconnect a TCP connection. During
+  // reconnecting, when a new tcp connection has being made, we can't send data
+  // packets out until the STUN binding is completed (i.e. the write state is
+  // set to WRITABLE again by Connection::OnConnectionRequestResponse). IPC
+  // socket, when receiving data packets before that, will trigger OnError which
+  // will terminate the newly created connection.
+  bool pretending_to_be_writable_;
+
+  // Allow test case to overwrite the default timeout period.
+  int reconnection_timeout_;
+
+  webrtc::ScopedTaskSafety network_safety_;
+
+  friend class TCPPort;
+};
+
+}  // namespace cricket
+
+#endif  // P2P_BASE_TCP_PORT_H_