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diff --git a/third_party/libwebrtc/api/test/metrics/proto/metric.proto b/third_party/libwebrtc/api/test/metrics/proto/metric.proto
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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.
+ */
+
+syntax = "proto3";
+
+package webrtc.test_metrics;
+
+// Root message of the proto file. Contains collection of all the metrics.
+message MetricsSet {
+  repeated Metric metrics = 1;
+}
+
+enum Unit {
+  // Default value that has to be defined.
+  UNDEFINED_UNIT = 0;
+  // 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.
+  UNITLESS = 1;
+  MILLISECONDS = 2;
+  PERCENT = 3;
+  BYTES = 4;
+  KILOBITS_PER_SECOND = 5;
+  HERTZ = 6;
+  COUNT = 7;
+}
+
+enum ImprovementDirection {
+  // Default value that has to be defined.
+  UNDEFINED_IMPROVEMENT_DIRECTION = 0;
+  BIGGER_IS_BETTER = 1;
+  NEITHER_IS_BETTER = 2;
+  SMALLER_IS_BETTER = 3;
+}
+
+// Single performance metric with all related metadata.
+message Metric {
+  // Metric name, for example PSNR, SSIM, decode_time, etc.
+  string name = 1;
+  Unit unit = 2;
+  ImprovementDirection improvement_direction = 3;
+  // If the metric is generated by a test, this field can be used to specify
+  // this information.
+  string test_case = 4;
+  // Metadata associated with the whole metric.
+  map<string, string> metric_metadata = 5;
+
+  message TimeSeries {
+    message Sample {
+      // Timestamp in microseconds associated with a sample. For example,
+      // the timestamp when the sample was collected.
+      int64 timestamp_us = 1;
+      double value = 2;
+      // Metadata associated with this particular sample.
+      map<string, string> sample_metadata = 3;
+    }
+    // All samples collected for this metric. It can be empty if the Metric
+    // object only contains `stats`.
+    repeated Sample samples = 1;
+  }
+  // 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 = 6;
+
+  // 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.
+  message Stats {
+    // Sample mean of the metric
+    // (https://en.wikipedia.org/wiki/Sample_mean_and_covariance).
+    optional double mean = 1;
+    // Standard deviation (https://en.wikipedia.org/wiki/Standard_deviation).
+    // Is undefined if `time_series` contains only a single sample.
+    optional double stddev = 2;
+    optional double min = 3;
+    optional double max = 4;
+  }
+  Stats stats = 7;
+}