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diff --git a/third_party/libwebrtc/api/test/metrics/metrics_accumulator.h b/third_party/libwebrtc/api/test/metrics/metrics_accumulator.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_METRICS_ACCUMULATOR_H_
+#define API_TEST_METRICS_METRICS_ACCUMULATOR_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/numerics/samples_stats_counter.h"
+#include "api/test/metrics/metric.h"
+#include "api/units/timestamp.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+namespace test {
+
+// Accumulates metrics' samples internally and provides API to get collected
+// ones.
+//
+// This object is thread safe.
+class MetricsAccumulator {
+ public:
+  MetricsAccumulator() = default;
+
+  // Adds sample for the specified `metric_name` within specified
+  // `test_case_name`. If it is the first time when this combination of
+  // `metric_name` and `test_case_name` is used, creates a new Metric to collect
+  // samples, otherwise adds a sample to the previously created Metric.
+  //
+  // By default metric will use `Unit::kUnitless` and
+  // `ImprovementDirection::kNeitherIsBetter`.
+  //
+  // `point_metadata` - the metadata to be added to the single data point that
+  // this method adds to the Metric (it is not a metric global metadata).
+  //
+  // Returns true if a new metric was created and false otherwise.
+  bool AddSample(absl::string_view metric_name,
+                 absl::string_view test_case_name,
+                 double value,
+                 Timestamp timestamp,
+                 std::map<std::string, std::string> point_metadata = {});
+
+  // Adds metadata to the metric specified by `metric_name` within specified
+  // `test_case_name`. If such a metric doesn't exist, creates a new one,
+  // otherwise overrides previously recorded values.
+  //
+  // Returns true if a new metric was created and false otherwise.
+  bool AddMetricMetadata(
+      absl::string_view metric_name,
+      absl::string_view test_case_name,
+      Unit unit,
+      ImprovementDirection improvement_direction,
+      std::map<std::string, std::string> metric_metadata = {});
+
+  // Returns all metrics collected by this accumulator. No order guarantees
+  // provided.
+  std::vector<Metric> GetCollectedMetrics() const;
+
+ private:
+  struct MetricKey {
+    MetricKey(absl::string_view metric_name, absl::string_view test_case_name)
+        : metric_name(metric_name), test_case_name(test_case_name) {}
+
+    std::string metric_name;
+    std::string test_case_name;
+  };
+  friend bool operator<(const MetricKey& a, const MetricKey& b);
+
+  struct MetricValue {
+    SamplesStatsCounter counter;
+    Metric metric;
+  };
+
+  // Gets existing metrics or creates a new one. If metric was created `created`
+  // will be set to true.
+  MetricValue* GetOrCreateMetric(absl::string_view metric_name,
+                                 absl::string_view test_case_name,
+                                 bool* created)
+      RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+
+  mutable Mutex mutex_;
+  std::map<MetricKey, MetricValue> metrics_ RTC_GUARDED_BY(mutex_);
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_METRICS_ACCUMULATOR_H_