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diff --git a/third_party/libwebrtc/api/test/track_id_stream_info_map.h b/third_party/libwebrtc/api/test/track_id_stream_info_map.h
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+++ b/third_party/libwebrtc/api/test/track_id_stream_info_map.h
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+/*
+ *  Copyright (c) 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_TEST_TRACK_ID_STREAM_INFO_MAP_H_
+#define API_TEST_TRACK_ID_STREAM_INFO_MAP_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+namespace webrtc_pc_e2e {
+
+// Instances of `TrackIdStreamInfoMap` provide bookkeeping capabilities that
+// are useful to associate stats reports track_ids to the remote stream info.
+class TrackIdStreamInfoMap {
+ public:
+  struct StreamInfo {
+    std::string receiver_peer;
+    std::string stream_label;
+    std::string sync_group;
+  };
+
+  virtual ~TrackIdStreamInfoMap() = default;
+
+  // These methods must be called on the same thread where
+  // StatsObserverInterface::OnStatsReports is invoked.
+
+  // Precondition: `track_id` must be already mapped to stream info.
+  virtual StreamInfo GetStreamInfoFromTrackId(
+      absl::string_view track_id) const = 0;
+};
+
+}  // namespace webrtc_pc_e2e
+}  // namespace webrtc
+
+#endif  // API_TEST_TRACK_ID_STREAM_INFO_MAP_H_