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diff --git a/third_party/libwebrtc/api/audio_codecs/audio_codec_pair_id.h b/third_party/libwebrtc/api/audio_codecs/audio_codec_pair_id.h
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+++ b/third_party/libwebrtc/api/audio_codecs/audio_codec_pair_id.h
@@ -0,0 +1,74 @@
+/*
+ *  Copyright (c) 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_AUDIO_CODECS_AUDIO_CODEC_PAIR_ID_H_
+#define API_AUDIO_CODECS_AUDIO_CODEC_PAIR_ID_H_
+
+#include <stdint.h>
+
+#include <utility>
+
+namespace webrtc {
+
+class AudioCodecPairId final {
+ public:
+  // Copyable, but not default constructible.
+  AudioCodecPairId() = delete;
+  AudioCodecPairId(const AudioCodecPairId&) = default;
+  AudioCodecPairId(AudioCodecPairId&&) = default;
+  AudioCodecPairId& operator=(const AudioCodecPairId&) = default;
+  AudioCodecPairId& operator=(AudioCodecPairId&&) = default;
+
+  friend void swap(AudioCodecPairId& a, AudioCodecPairId& b) {
+    using std::swap;
+    swap(a.id_, b.id_);
+  }
+
+  // Creates a new ID, unequal to any previously created ID.
+  static AudioCodecPairId Create();
+
+  // IDs can be tested for equality.
+  friend bool operator==(AudioCodecPairId a, AudioCodecPairId b) {
+    return a.id_ == b.id_;
+  }
+  friend bool operator!=(AudioCodecPairId a, AudioCodecPairId b) {
+    return a.id_ != b.id_;
+  }
+
+  // Comparisons. The ordering of ID values is completely arbitrary, but
+  // stable, so it's useful e.g. if you want to use IDs as keys in an ordered
+  // map.
+  friend bool operator<(AudioCodecPairId a, AudioCodecPairId b) {
+    return a.id_ < b.id_;
+  }
+  friend bool operator<=(AudioCodecPairId a, AudioCodecPairId b) {
+    return a.id_ <= b.id_;
+  }
+  friend bool operator>=(AudioCodecPairId a, AudioCodecPairId b) {
+    return a.id_ >= b.id_;
+  }
+  friend bool operator>(AudioCodecPairId a, AudioCodecPairId b) {
+    return a.id_ > b.id_;
+  }
+
+  // Returns a numeric representation of the ID. The numeric values are
+  // completely arbitrary, but stable, collision-free, and reasonably evenly
+  // distributed, so they are e.g. useful as hash values in unordered maps.
+  uint64_t NumericRepresentation() const { return id_; }
+
+ private:
+  explicit AudioCodecPairId(uint64_t id) : id_(id) {}
+
+  uint64_t id_;
+};
+
+}  // namespace webrtc
+
+#endif  // API_AUDIO_CODECS_AUDIO_CODEC_PAIR_ID_H_