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diff --git a/third_party/libwebrtc/api/jsep_session_description.h b/third_party/libwebrtc/api/jsep_session_description.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.
+ */
+
+// TODO(deadbeef): Move this out of api/; it's an implementation detail and
+// shouldn't be used externally.
+
+#ifndef API_JSEP_SESSION_DESCRIPTION_H_
+#define API_JSEP_SESSION_DESCRIPTION_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/candidate.h"
+#include "api/jsep.h"
+#include "api/jsep_ice_candidate.h"
+
+namespace cricket {
+class SessionDescription;
+}
+
+namespace webrtc {
+
+// Implementation of SessionDescriptionInterface.
+class JsepSessionDescription : public SessionDescriptionInterface {
+ public:
+  explicit JsepSessionDescription(SdpType type);
+  // TODO(steveanton): Remove this once callers have switched to SdpType.
+  explicit JsepSessionDescription(const std::string& type);
+  JsepSessionDescription(
+      SdpType type,
+      std::unique_ptr<cricket::SessionDescription> description,
+      absl::string_view session_id,
+      absl::string_view session_version);
+  virtual ~JsepSessionDescription();
+
+  JsepSessionDescription(const JsepSessionDescription&) = delete;
+  JsepSessionDescription& operator=(const JsepSessionDescription&) = delete;
+
+  // Takes ownership of `description`.
+  bool Initialize(std::unique_ptr<cricket::SessionDescription> description,
+                  const std::string& session_id,
+                  const std::string& session_version);
+
+  virtual std::unique_ptr<SessionDescriptionInterface> Clone() const;
+
+  virtual cricket::SessionDescription* description() {
+    return description_.get();
+  }
+  virtual const cricket::SessionDescription* description() const {
+    return description_.get();
+  }
+  virtual std::string session_id() const { return session_id_; }
+  virtual std::string session_version() const { return session_version_; }
+  virtual SdpType GetType() const { return type_; }
+  virtual std::string type() const { return SdpTypeToString(type_); }
+  // Allows changing the type. Used for testing.
+  virtual bool AddCandidate(const IceCandidateInterface* candidate);
+  virtual size_t RemoveCandidates(
+      const std::vector<cricket::Candidate>& candidates);
+  virtual size_t number_of_mediasections() const;
+  virtual const IceCandidateCollection* candidates(
+      size_t mediasection_index) const;
+  virtual bool ToString(std::string* out) const;
+
+  static const int kDefaultVideoCodecId;
+  static const char kDefaultVideoCodecName[];
+
+ private:
+  std::unique_ptr<cricket::SessionDescription> description_;
+  std::string session_id_;
+  std::string session_version_;
+  SdpType type_;
+  std::vector<JsepCandidateCollection> candidate_collection_;
+
+  bool GetMediasectionIndex(const IceCandidateInterface* candidate,
+                            size_t* index);
+  int GetMediasectionIndex(const cricket::Candidate& candidate);
+};
+
+}  // namespace webrtc
+
+#endif  // API_JSEP_SESSION_DESCRIPTION_H_