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diff --git a/third_party/libwebrtc/api/dtls_transport_interface.h b/third_party/libwebrtc/api/dtls_transport_interface.h
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+++ b/third_party/libwebrtc/api/dtls_transport_interface.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_DTLS_TRANSPORT_INTERFACE_H_
+#define API_DTLS_TRANSPORT_INTERFACE_H_
+
+#include <memory>
+#include <utility>
+
+#include "absl/types/optional.h"
+#include "api/ice_transport_interface.h"
+#include "api/rtc_error.h"
+#include "api/scoped_refptr.h"
+#include "rtc_base/ref_count.h"
+#include "rtc_base/ssl_certificate.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// States of a DTLS transport, corresponding to the JS API specification.
+// http://w3c.github.io/webrtc-pc/#dom-rtcdtlstransportstate
+enum class DtlsTransportState {
+  kNew,         // Has not started negotiating yet.
+  kConnecting,  // In the process of negotiating a secure connection.
+  kConnected,   // Completed negotiation and verified fingerprints.
+  kClosed,      // Intentionally closed.
+  kFailed,      // Failure due to an error or failing to verify a remote
+                // fingerprint.
+  kNumValues
+};
+
+enum class DtlsTransportTlsRole {
+  kServer,  // Other end sends CLIENT_HELLO
+  kClient   // This end sends CLIENT_HELLO
+};
+
+// This object gives snapshot information about the changeable state of a
+// DTLSTransport.
+class RTC_EXPORT DtlsTransportInformation {
+ public:
+  DtlsTransportInformation();
+  explicit DtlsTransportInformation(DtlsTransportState state);
+  DtlsTransportInformation(
+      DtlsTransportState state,
+      absl::optional<DtlsTransportTlsRole> role,
+      absl::optional<int> tls_version,
+      absl::optional<int> ssl_cipher_suite,
+      absl::optional<int> srtp_cipher_suite,
+      std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates);
+  ABSL_DEPRECATED("Use version with role parameter")
+  DtlsTransportInformation(
+      DtlsTransportState state,
+      absl::optional<int> tls_version,
+      absl::optional<int> ssl_cipher_suite,
+      absl::optional<int> srtp_cipher_suite,
+      std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates);
+
+  // Copy and assign
+  DtlsTransportInformation(const DtlsTransportInformation& c);
+  DtlsTransportInformation& operator=(const DtlsTransportInformation& c);
+  // Move
+  DtlsTransportInformation(DtlsTransportInformation&& other) = default;
+  DtlsTransportInformation& operator=(DtlsTransportInformation&& other) =
+      default;
+
+  DtlsTransportState state() const { return state_; }
+  absl::optional<DtlsTransportTlsRole> role() const { return role_; }
+  absl::optional<int> tls_version() const { return tls_version_; }
+  absl::optional<int> ssl_cipher_suite() const { return ssl_cipher_suite_; }
+  absl::optional<int> srtp_cipher_suite() const { return srtp_cipher_suite_; }
+  // The accessor returns a temporary pointer, it does not release ownership.
+  const rtc::SSLCertChain* remote_ssl_certificates() const {
+    return remote_ssl_certificates_.get();
+  }
+
+ private:
+  DtlsTransportState state_;
+  absl::optional<DtlsTransportTlsRole> role_;
+  absl::optional<int> tls_version_;
+  absl::optional<int> ssl_cipher_suite_;
+  absl::optional<int> srtp_cipher_suite_;
+  std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates_;
+};
+
+class DtlsTransportObserverInterface {
+ public:
+  // This callback carries information about the state of the transport.
+  // The argument is a pass-by-value snapshot of the state.
+  virtual void OnStateChange(DtlsTransportInformation info) = 0;
+  // This callback is called when an error occurs, causing the transport
+  // to go to the kFailed state.
+  virtual void OnError(RTCError error) = 0;
+
+ protected:
+  virtual ~DtlsTransportObserverInterface() = default;
+};
+
+// A DTLS transport, as represented to the outside world.
+// This object is created on the network thread, and can only be
+// accessed on that thread, except for functions explicitly marked otherwise.
+// References can be held by other threads, and destruction can therefore
+// be initiated by other threads.
+class DtlsTransportInterface : public rtc::RefCountInterface {
+ public:
+  // Returns a pointer to the ICE transport that is owned by the DTLS transport.
+  virtual rtc::scoped_refptr<IceTransportInterface> ice_transport() = 0;
+  // Returns information on the state of the DtlsTransport.
+  // This function can be called from other threads.
+  virtual DtlsTransportInformation Information() = 0;
+  // Observer management.
+  virtual void RegisterObserver(DtlsTransportObserverInterface* observer) = 0;
+  virtual void UnregisterObserver() = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_DTLS_TRANSPORT_INTERFACE_H_