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diff --git a/third_party/libwebrtc/api/test/metrics/metric.h b/third_party/libwebrtc/api/test/metrics/metric.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 API_TEST_METRICS_METRIC_H_
+#define API_TEST_METRICS_METRIC_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/units/timestamp.h"
+
+namespace webrtc {
+namespace test {
+
+enum class Unit {
+  kMilliseconds,
+  kPercent,
+  kBytes,
+  kKilobitsPerSecond,
+  kHertz,
+  // General unitless value. Can be used either for dimensionless quantities
+  // (ex ratio) or for units not presented in this enum and too specific to add
+  // to this enum.
+  kUnitless,
+  kCount
+};
+
+absl::string_view ToString(Unit unit);
+
+enum class ImprovementDirection {
+  kBiggerIsBetter,
+  kNeitherIsBetter,
+  kSmallerIsBetter
+};
+
+absl::string_view ToString(ImprovementDirection direction);
+
+struct Metric {
+  struct TimeSeries {
+    struct Sample {
+      // Timestamp in microseconds associated with a sample. For example,
+      // the timestamp when the sample was collected.
+      webrtc::Timestamp timestamp;
+      double value;
+      // Metadata associated with this particular sample.
+      std::map<std::string, std::string> sample_metadata;
+    };
+
+    // All samples collected for this metric. It can be empty if the Metric
+    // object only contains `stats`.
+    std::vector<Sample> samples;
+  };
+
+  // Contains metric's precomputed statistics based on the `time_series` or if
+  // `time_series` is omitted (has 0 samples) contains precomputed statistics
+  // provided by the metric's calculator.
+  struct Stats {
+    // Sample mean of the metric
+    // (https://en.wikipedia.org/wiki/Sample_mean_and_covariance).
+    absl::optional<double> mean;
+    // Standard deviation (https://en.wikipedia.org/wiki/Standard_deviation).
+    // Is undefined if `time_series` contains only a single value.
+    absl::optional<double> stddev;
+    absl::optional<double> min;
+    absl::optional<double> max;
+  };
+
+  // Metric name, for example PSNR, SSIM, decode_time, etc.
+  std::string name;
+  Unit unit;
+  ImprovementDirection improvement_direction;
+  // If the metric is generated by a test, this field can be used to specify
+  // this information.
+  std::string test_case;
+  // Metadata associated with the whole metric.
+  std::map<std::string, std::string> metric_metadata;
+  // Contains all samples of the metric collected during test execution.
+  // It can be empty if the user only stores precomputed statistics into
+  // `stats`.
+  TimeSeries time_series;
+  Stats stats;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_METRIC_H_