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diff --git a/third_party/libwebrtc/pc/sdp_serializer.h b/third_party/libwebrtc/pc/sdp_serializer.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 PC_SDP_SERIALIZER_H_
+#define PC_SDP_SERIALIZER_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "api/rtc_error.h"
+#include "media/base/rid_description.h"
+#include "pc/session_description.h"
+#include "pc/simulcast_description.h"
+
+namespace webrtc {
+
+// This class should serialize components of the SDP (and not the SDP itself).
+// Example:
+//     SimulcastDescription can be serialized and deserialized by this class.
+//     The serializer will know how to translate the data to spec-compliant
+//     format without knowing about the SDP attribute details (a=simulcast:)
+// Usage:
+//     Consider the SDP attribute for simulcast a=simulcast:<configuration>.
+//     The SDP serializtion code (webrtcsdp.h) should use `SdpSerializer` to
+//     serialize and deserialize the <configuration> section.
+// This class will allow testing the serialization of components without
+// having to serialize the entire SDP while hiding implementation details
+// from callers of sdp serialization (webrtcsdp.h).
+class SdpSerializer {
+ public:
+  // Serialization for the Simulcast description according to
+  // https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-13#section-5.1
+  std::string SerializeSimulcastDescription(
+      const cricket::SimulcastDescription& simulcast) const;
+
+  // Deserialization for the SimulcastDescription according to
+  // https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-13#section-5.1
+  RTCErrorOr<cricket::SimulcastDescription> DeserializeSimulcastDescription(
+      absl::string_view string) const;
+
+  // Serialization for the RID description according to
+  // https://tools.ietf.org/html/draft-ietf-mmusic-rid-15#section-10
+  std::string SerializeRidDescription(
+      const cricket::RidDescription& rid_description) const;
+
+  // Deserialization for the RidDescription according to
+  // https://tools.ietf.org/html/draft-ietf-mmusic-rid-15#section-10
+  RTCErrorOr<cricket::RidDescription> DeserializeRidDescription(
+      absl::string_view string) const;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_SDP_SERIALIZER_H_