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diff --git a/third_party/libwebrtc/api/sctp_transport_interface.h b/third_party/libwebrtc/api/sctp_transport_interface.h
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+/*
+ *  Copyright 2019 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_SCTP_TRANSPORT_INTERFACE_H_
+#define API_SCTP_TRANSPORT_INTERFACE_H_
+
+#include "absl/types/optional.h"
+#include "api/dtls_transport_interface.h"
+#include "api/rtc_error.h"
+#include "api/scoped_refptr.h"
+#include "rtc_base/ref_count.h"
+
+namespace webrtc {
+
+// States of a SCTP transport, corresponding to the JS API specification.
+// http://w3c.github.io/webrtc-pc/#dom-rtcsctptransportstate
+enum class SctpTransportState {
+  kNew,         // Has not started negotiating yet. Non-standard state.
+  kConnecting,  // In the process of negotiating an association.
+  kConnected,   // Completed negotiation of an association.
+  kClosed,      // Closed by local or remote party.
+  kNumValues
+};
+
+// This object gives snapshot information about the changeable state of a
+// SctpTransport.
+// It reflects the readonly attributes of the object in the specification.
+// http://w3c.github.io/webrtc-pc/#rtcsctptransport-interface
+class RTC_EXPORT SctpTransportInformation {
+ public:
+  SctpTransportInformation() = default;
+  SctpTransportInformation(const SctpTransportInformation&) = default;
+  explicit SctpTransportInformation(SctpTransportState state);
+  SctpTransportInformation(
+      SctpTransportState state,
+      rtc::scoped_refptr<DtlsTransportInterface> dtls_transport,
+      absl::optional<double> max_message_size,
+      absl::optional<int> max_channels);
+  ~SctpTransportInformation();
+  // The DTLS transport that supports this SCTP transport.
+  rtc::scoped_refptr<DtlsTransportInterface> dtls_transport() const {
+    return dtls_transport_;
+  }
+  SctpTransportState state() const { return state_; }
+  absl::optional<double> MaxMessageSize() const { return max_message_size_; }
+  absl::optional<int> MaxChannels() const { return max_channels_; }
+
+ private:
+  SctpTransportState state_;
+  rtc::scoped_refptr<DtlsTransportInterface> dtls_transport_;
+  absl::optional<double> max_message_size_;
+  absl::optional<int> max_channels_;
+};
+
+class SctpTransportObserverInterface {
+ public:
+  // This callback carries information about the state of the transport.
+  // The argument is a pass-by-value snapshot of the state.
+  // The callback will be called on the network thread.
+  virtual void OnStateChange(SctpTransportInformation info) = 0;
+
+ protected:
+  virtual ~SctpTransportObserverInterface() = default;
+};
+
+// A SCTP 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 SctpTransportInterface : public rtc::RefCountInterface {
+ public:
+  // This function can be called from other threads.
+  virtual rtc::scoped_refptr<DtlsTransportInterface> dtls_transport() const = 0;
+  // Returns information on the state of the SctpTransport.
+  // This function can be called from other threads.
+  virtual SctpTransportInformation Information() const = 0;
+  // Observer management.
+  virtual void RegisterObserver(SctpTransportObserverInterface* observer) = 0;
+  virtual void UnregisterObserver() = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_SCTP_TRANSPORT_INTERFACE_H_