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diff --git a/third_party/libwebrtc/p2p/base/transport_description_factory.h b/third_party/libwebrtc/p2p/base/transport_description_factory.h
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+/*
+ *  Copyright 2012 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_TRANSPORT_DESCRIPTION_FACTORY_H_
+#define P2P_BASE_TRANSPORT_DESCRIPTION_FACTORY_H_
+
+#include <memory>
+#include <utility>
+
+#include "api/field_trials_view.h"
+#include "p2p/base/ice_credentials_iterator.h"
+#include "p2p/base/transport_description.h"
+#include "rtc_base/rtc_certificate.h"
+
+namespace rtc {
+class SSLIdentity;
+}
+
+namespace cricket {
+
+struct TransportOptions {
+  bool ice_restart = false;
+  bool prefer_passive_role = false;
+  // If true, ICE renomination is supported and will be used if it is also
+  // supported by the remote side.
+  bool enable_ice_renomination = false;
+};
+
+// Creates transport descriptions according to the supplied configuration.
+// When creating answers, performs the appropriate negotiation
+// of the various fields to determine the proper result.
+class TransportDescriptionFactory {
+ public:
+  // Default ctor; use methods below to set configuration.
+  explicit TransportDescriptionFactory(
+      const webrtc::FieldTrialsView& field_trials);
+  ~TransportDescriptionFactory();
+
+  SecurePolicy secure() const { return secure_; }
+  // The certificate to use when setting up DTLS.
+  const rtc::scoped_refptr<rtc::RTCCertificate>& certificate() const {
+    return certificate_;
+  }
+
+  // Specifies the transport security policy to use.
+  void set_secure(SecurePolicy s) { secure_ = s; }
+  // Specifies the certificate to use (only used when secure != SEC_DISABLED).
+  void set_certificate(rtc::scoped_refptr<rtc::RTCCertificate> certificate) {
+    certificate_ = std::move(certificate);
+  }
+
+  // Creates a transport description suitable for use in an offer.
+  std::unique_ptr<TransportDescription> CreateOffer(
+      const TransportOptions& options,
+      const TransportDescription* current_description,
+      IceCredentialsIterator* ice_credentials) const;
+  // Create a transport description that is a response to an offer.
+  //
+  // If `require_transport_attributes` is true, then TRANSPORT category
+  // attributes are expected to be present in `offer`, as defined by
+  // sdp-mux-attributes, and null will be returned otherwise. It's expected
+  // that this will be set to false for an m= section that's in a BUNDLE group
+  // but isn't the first m= section in the group.
+  std::unique_ptr<TransportDescription> CreateAnswer(
+      const TransportDescription* offer,
+      const TransportOptions& options,
+      bool require_transport_attributes,
+      const TransportDescription* current_description,
+      IceCredentialsIterator* ice_credentials) const;
+
+  const webrtc::FieldTrialsView& trials() const { return field_trials_; }
+
+ private:
+  bool SetSecurityInfo(TransportDescription* description,
+                       ConnectionRole role) const;
+
+  SecurePolicy secure_;
+  rtc::scoped_refptr<rtc::RTCCertificate> certificate_;
+  const webrtc::FieldTrialsView& field_trials_;
+};
+
+}  // namespace cricket
+
+#endif  // P2P_BASE_TRANSPORT_DESCRIPTION_FACTORY_H_