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diff --git a/third_party/libwebrtc/test/pc/e2e/metric_metadata_keys.h b/third_party/libwebrtc/test/pc/e2e/metric_metadata_keys.h
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+++ b/third_party/libwebrtc/test/pc/e2e/metric_metadata_keys.h
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+/*
+ *  Copyright (c) 2022 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 TEST_PC_E2E_METRIC_METADATA_KEYS_H_
+#define TEST_PC_E2E_METRIC_METADATA_KEYS_H_
+
+#include <string>
+
+namespace webrtc {
+namespace webrtc_pc_e2e {
+
+// All metadata fields are present only if applicable for particular metric.
+class MetricMetadataKey {
+ public:
+  // Represents on peer with whom the metric is associated.
+  static constexpr char kPeerMetadataKey[] = "peer";
+  // Represents sender of the media stream.
+  static constexpr char kSenderMetadataKey[] = "sender";
+  // Represents receiver of the media stream.
+  static constexpr char kReceiverMetadataKey[] = "receiver";
+  // Represents name of the audio stream.
+  static constexpr char kAudioStreamMetadataKey[] = "audio_stream";
+  // Represents name of the video stream.
+  static constexpr char kVideoStreamMetadataKey[] = "video_stream";
+  // Represents name of the sync group to which stream belongs.
+  static constexpr char kPeerSyncGroupMetadataKey[] = "peer_sync_group";
+  // Represents the test name (without any peer and stream data appended to it
+  // as it currently happens with the webrtc.test_metrics.Metric.test_case
+  // field). This metadata is temporary and it will be removed once this
+  // information is moved to webrtc.test_metrics.Metric.test_case.
+  // TODO(bugs.webrtc.org/14757): Remove kExperimentalTestNameMetadataKey.
+  static constexpr char kExperimentalTestNameMetadataKey[] =
+      "experimental_test_name";
+  // Represents index of a video spatial layer to which metric belongs.
+  static constexpr char kSpatialLayerMetadataKey[] = "spatial_layer";
+
+ private:
+  MetricMetadataKey() = default;
+};
+
+// All metadata fields are presented only if applicable for particular metric.
+class SampleMetadataKey {
+ public:
+  // Represents a frame ID with which data point is associated.
+  static constexpr char kFrameIdMetadataKey[] = "frame_id";
+
+ private:
+  SampleMetadataKey() = default;
+};
+
+}  // namespace webrtc_pc_e2e
+}  // namespace webrtc
+
+#endif  // TEST_PC_E2E_METRIC_METADATA_KEYS_H_