Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

27 files changed, 3378 insertions, 0 deletions

diff --git a/third_party/libwebrtc/api/test/metrics/BUILD.gn b/third_party/libwebrtc/api/test/metrics/BUILD.gn
new file mode 100644
index 0000000000..309b699329
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/BUILD.gn
@@ -0,0 +1,281 @@
+# 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.
+
+import("../../../webrtc.gni")
+if (rtc_enable_protobuf) {
+  import("//third_party/protobuf/proto_library.gni")
+}
+
+group("metrics") {
+  deps = [
+    ":global_metrics_logger_and_exporter",
+    ":metric",
+    ":metrics_accumulator",
+    ":metrics_exporter",
+    ":metrics_logger",
+    ":stdout_metrics_exporter",
+  ]
+}
+
+if (rtc_include_tests) {
+  group("metrics_unittests") {
+    testonly = true
+
+    deps = [
+      ":global_metrics_logger_and_exporter_test",
+      ":metrics_accumulator_test",
+      ":metrics_logger_test",
+      ":print_result_proxy_metrics_exporter_test",
+      ":stdout_metrics_exporter_test",
+    ]
+
+    if (rtc_enable_protobuf) {
+      deps += [
+        ":chrome_perf_dashboard_metrics_exporter_test",
+        ":metrics_set_proto_file_exporter_test",
+      ]
+    }
+  }
+}
+
+rtc_library("metric") {
+  visibility = [ "*" ]
+  sources = [
+    "metric.cc",
+    "metric.h",
+  ]
+  absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+  deps = [ "../../../api/units:timestamp" ]
+}
+
+rtc_library("metrics_logger") {
+  visibility = [ "*" ]
+  sources = [
+    "metrics_logger.cc",
+    "metrics_logger.h",
+  ]
+  deps = [
+    ":metric",
+    ":metrics_accumulator",
+    "../..:array_view",
+    "../../../rtc_base/synchronization:mutex",
+    "../../../system_wrappers",
+    "../../numerics",
+  ]
+  absl_deps = [ "//third_party/abseil-cpp/absl/strings" ]
+}
+
+rtc_library("metrics_accumulator") {
+  visibility = [ "*" ]
+  sources = [
+    "metrics_accumulator.cc",
+    "metrics_accumulator.h",
+  ]
+  deps = [
+    ":metric",
+    "../../../rtc_base:macromagic",
+    "../../../rtc_base/synchronization:mutex",
+    "../../numerics",
+    "../../units:timestamp",
+  ]
+  absl_deps = [ "//third_party/abseil-cpp/absl/strings" ]
+}
+
+rtc_library("metrics_exporter") {
+  visibility = [ "*" ]
+  sources = [ "metrics_exporter.h" ]
+  deps = [
+    ":metric",
+    "../..:array_view",
+  ]
+}
+
+rtc_library("stdout_metrics_exporter") {
+  visibility = [ "*" ]
+  sources = [
+    "stdout_metrics_exporter.cc",
+    "stdout_metrics_exporter.h",
+  ]
+  deps = [
+    ":metric",
+    ":metrics_exporter",
+    "../..:array_view",
+    "../../../rtc_base:stringutils",
+  ]
+  absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+}
+
+rtc_library("chrome_perf_dashboard_metrics_exporter") {
+  visibility = [ "*" ]
+  testonly = true
+  sources = [
+    "chrome_perf_dashboard_metrics_exporter.cc",
+    "chrome_perf_dashboard_metrics_exporter.h",
+  ]
+  deps = [
+    ":metric",
+    ":metrics_exporter",
+    "../../../api:array_view",
+    "../../../test:fileutils",
+    "../../../test:perf_test",
+  ]
+  absl_deps = [
+    "//third_party/abseil-cpp/absl/memory",
+    "//third_party/abseil-cpp/absl/strings",
+  ]
+}
+
+if (rtc_enable_protobuf) {
+  proto_library("metric_proto") {
+    visibility = [ "*" ]
+    sources = [ "proto/metric.proto" ]
+    proto_out_dir = "api/test/metrics/proto"
+    cc_generator_options = "lite"
+  }
+}
+
+rtc_library("metrics_set_proto_file_exporter") {
+  visibility = [ "*" ]
+  testonly = true
+  sources = [
+    "metrics_set_proto_file_exporter.cc",
+    "metrics_set_proto_file_exporter.h",
+  ]
+  deps = [
+    ":metric",
+    ":metrics_exporter",
+    "../..:array_view",
+    "../../../rtc_base:logging",
+    "../../../test:fileutils",
+  ]
+
+  if (rtc_enable_protobuf) {
+    deps += [ ":metric_proto" ]
+  }
+}
+
+rtc_library("print_result_proxy_metrics_exporter") {
+  visibility = [ "*" ]
+  testonly = true
+  sources = [
+    "print_result_proxy_metrics_exporter.cc",
+    "print_result_proxy_metrics_exporter.h",
+  ]
+  deps = [
+    ":metric",
+    ":metrics_exporter",
+    "../..:array_view",
+    "../../../test:perf_test",
+  ]
+}
+
+rtc_library("global_metrics_logger_and_exporter") {
+  visibility = [ "*" ]
+  sources = [
+    "global_metrics_logger_and_exporter.cc",
+    "global_metrics_logger_and_exporter.h",
+  ]
+  deps = [
+    ":metrics_exporter",
+    ":metrics_logger",
+    "../../../rtc_base:checks",
+    "../../../system_wrappers",
+  ]
+}
+
+if (rtc_include_tests) {
+  rtc_library("metrics_logger_test") {
+    testonly = true
+    sources = [ "metrics_logger_test.cc" ]
+    deps = [
+      ":metric",
+      ":metrics_logger",
+      "../../../system_wrappers",
+      "../../../test:test_support",
+      "../../numerics",
+    ]
+    absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+  }
+
+  rtc_library("metrics_accumulator_test") {
+    testonly = true
+    sources = [ "metrics_accumulator_test.cc" ]
+    deps = [
+      ":metric",
+      ":metrics_accumulator",
+      "../../../test:test_support",
+      "../../units:timestamp",
+    ]
+    absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+  }
+
+  rtc_library("stdout_metrics_exporter_test") {
+    testonly = true
+    sources = [ "stdout_metrics_exporter_test.cc" ]
+    deps = [
+      ":metric",
+      ":stdout_metrics_exporter",
+      "../../../test:test_support",
+      "../../units:timestamp",
+    ]
+  }
+
+  rtc_library("print_result_proxy_metrics_exporter_test") {
+    testonly = true
+    sources = [ "print_result_proxy_metrics_exporter_test.cc" ]
+    deps = [
+      ":metric",
+      ":print_result_proxy_metrics_exporter",
+      "../../../test:test_support",
+      "../../units:timestamp",
+    ]
+  }
+
+  rtc_library("global_metrics_logger_and_exporter_test") {
+    testonly = true
+    sources = [ "global_metrics_logger_and_exporter_test.cc" ]
+    deps = [
+      ":global_metrics_logger_and_exporter",
+      ":metric",
+      ":metrics_exporter",
+      ":metrics_logger",
+      "../../../system_wrappers",
+      "../../../test:test_support",
+    ]
+    absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+  }
+
+  if (rtc_enable_protobuf) {
+    rtc_library("metrics_set_proto_file_exporter_test") {
+      testonly = true
+      sources = [ "metrics_set_proto_file_exporter_test.cc" ]
+      deps = [
+        ":metric",
+        ":metric_proto",
+        ":metrics_set_proto_file_exporter",
+        "../../../rtc_base:protobuf_utils",
+        "../../../test:fileutils",
+        "../../../test:test_support",
+        "../../units:timestamp",
+      ]
+    }
+
+    rtc_library("chrome_perf_dashboard_metrics_exporter_test") {
+      testonly = true
+      sources = [ "chrome_perf_dashboard_metrics_exporter_test.cc" ]
+      deps = [
+        ":chrome_perf_dashboard_metrics_exporter",
+        ":metric",
+        "../../../api/units:timestamp",
+        "../../../test:fileutils",
+        "../../../test:test_support",
+        "//third_party/catapult/tracing/tracing:histogram",
+      ]
+    }
+  }
+}
diff --git a/third_party/libwebrtc/api/test/metrics/DEPS b/third_party/libwebrtc/api/test/metrics/DEPS
new file mode 100644
index 0000000000..74889c61c7
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/DEPS
@@ -0,0 +1,14 @@
+specific_include_rules = {
+  "metrics_logger_and_exporter\.h": [
+    "+rtc_base/synchronization/mutex.h",
+    "+system_wrappers/include/clock.h",
+  ],
+  "metrics_logger\.h": [
+    "+rtc_base/synchronization/mutex.h",
+    "+system_wrappers/include/clock.h",
+  ],
+  "metrics_accumulator\.h": [
+    "+rtc_base/synchronization/mutex.h",
+    "+rtc_base/thread_annotations.h",
+  ],
+}
diff --git a/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter.cc b/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter.cc
new file mode 100644
index 0000000000..018d110b12
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter.cc
@@ -0,0 +1,146 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/chrome_perf_dashboard_metrics_exporter.h"
+
+#include <stdio.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/memory/memory.h"
+#include "absl/strings/string_view.h"
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+#include "test/testsupport/file_utils.h"
+#include "test/testsupport/perf_test_histogram_writer.h"
+#include "test/testsupport/perf_test_result_writer.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+std::string ToChromePerfDashboardUnit(Unit unit) {
+  switch (unit) {
+    case Unit::kMilliseconds:
+      return "msBestFitFormat";
+    case Unit::kPercent:
+      return "n%";
+    case Unit::kBytes:
+      return "sizeInBytes";
+    case Unit::kKilobitsPerSecond:
+      // Chrome Perf Dashboard doesn't have kpbs units, so we change the unit
+      // and value accordingly.
+      return "bytesPerSecond";
+    case Unit::kHertz:
+      return "Hz";
+    case Unit::kUnitless:
+      return "unitless";
+    case Unit::kCount:
+      return "count";
+  }
+}
+
+double ToChromePerfDashboardValue(double value, Unit unit) {
+  switch (unit) {
+    case Unit::kKilobitsPerSecond:
+      // Chrome Perf Dashboard doesn't have kpbs units, so we change the unit
+      // and value accordingly.
+      return value * 1000 / 8;
+    default:
+      return value;
+  }
+}
+
+ImproveDirection ToChromePerfDashboardImproveDirection(
+    ImprovementDirection direction) {
+  switch (direction) {
+    case ImprovementDirection::kBiggerIsBetter:
+      return ImproveDirection::kBiggerIsBetter;
+    case ImprovementDirection::kNeitherIsBetter:
+      return ImproveDirection::kNone;
+    case ImprovementDirection::kSmallerIsBetter:
+      return ImproveDirection::kSmallerIsBetter;
+  }
+}
+
+bool WriteMetricsToFile(const std::string& path, const std::string& data) {
+  CreateDir(DirName(path));
+  FILE* output = fopen(path.c_str(), "wb");
+  if (output == NULL) {
+    printf("Failed to write to %s.\n", path.c_str());
+    return false;
+  }
+  size_t written = fwrite(data.c_str(), sizeof(char), data.size(), output);
+  fclose(output);
+
+  if (written != data.size()) {
+    size_t expected = data.size();
+    printf("Wrote %zu, tried to write %zu\n", written, expected);
+    return false;
+  }
+  return true;
+}
+
+bool IsEmpty(const Metric::Stats& stats) {
+  return !stats.mean.has_value() && !stats.stddev.has_value() &&
+         !stats.min.has_value() && !stats.max.has_value();
+}
+
+}  // namespace
+
+ChromePerfDashboardMetricsExporter::ChromePerfDashboardMetricsExporter(
+    absl::string_view export_file_path)
+    : export_file_path_(export_file_path) {}
+
+bool ChromePerfDashboardMetricsExporter::Export(
+    rtc::ArrayView<const Metric> metrics) {
+  std::unique_ptr<PerfTestResultWriter> writer =
+      absl::WrapUnique<PerfTestResultWriter>(CreateHistogramWriter());
+  for (const Metric& metric : metrics) {
+    if (metric.time_series.samples.empty() && IsEmpty(metric.stats)) {
+      // If there were no data collected for the metric it is expected that 0
+      // will be exported, so add 0 to the samples.
+      writer->LogResult(
+          metric.name, metric.test_case,
+          ToChromePerfDashboardValue(0, metric.unit),
+          ToChromePerfDashboardUnit(metric.unit),
+          /*important=*/false,
+          ToChromePerfDashboardImproveDirection(metric.improvement_direction));
+      continue;
+    }
+
+    if (metric.time_series.samples.empty()) {
+      writer->LogResultMeanAndError(
+          metric.name, metric.test_case,
+          ToChromePerfDashboardValue(*metric.stats.mean, metric.unit),
+          ToChromePerfDashboardValue(*metric.stats.stddev, metric.unit),
+          ToChromePerfDashboardUnit(metric.unit),
+          /*important=*/false,
+          ToChromePerfDashboardImproveDirection(metric.improvement_direction));
+      continue;
+    }
+
+    std::vector<double> samples(metric.time_series.samples.size());
+    for (size_t i = 0; i < metric.time_series.samples.size(); ++i) {
+      samples[i] = ToChromePerfDashboardValue(
+          metric.time_series.samples[i].value, metric.unit);
+    }
+    writer->LogResultList(
+        metric.name, metric.test_case, samples,
+        ToChromePerfDashboardUnit(metric.unit),
+        /*important=*/false,
+        ToChromePerfDashboardImproveDirection(metric.improvement_direction));
+  }
+  return WriteMetricsToFile(export_file_path_, writer->Serialize());
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter.h b/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter.h
new file mode 100644
index 0000000000..dda17a08c6
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter.h
@@ -0,0 +1,41 @@
+/*
+ *  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_CHROME_PERF_DASHBOARD_METRICS_EXPORTER_H_
+#define API_TEST_METRICS_CHROME_PERF_DASHBOARD_METRICS_EXPORTER_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+#include "api/test/metrics/metrics_exporter.h"
+
+namespace webrtc {
+namespace test {
+
+// Exports all collected metrics in the Chrome Perf Dashboard proto format.
+class ChromePerfDashboardMetricsExporter : public MetricsExporter {
+ public:
+  // `export_file_path` - path where the proto file will be written.
+  explicit ChromePerfDashboardMetricsExporter(
+      absl::string_view export_file_path);
+  ~ChromePerfDashboardMetricsExporter() override = default;
+
+  bool Export(rtc::ArrayView<const Metric> metrics) override;
+
+ private:
+  const std::string export_file_path_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_CHROME_PERF_DASHBOARD_METRICS_EXPORTER_H_
diff --git a/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter_test.cc b/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter_test.cc
new file mode 100644
index 0000000000..5d3136f49a
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/chrome_perf_dashboard_metrics_exporter_test.cc
@@ -0,0 +1,248 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/chrome_perf_dashboard_metrics_exporter.h"
+
+#include <fstream>
+#include <map>
+#include <vector>
+
+#include "api/test/metrics/metric.h"
+#include "api/units/timestamp.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+#include "test/testsupport/file_utils.h"
+#include "third_party/catapult/tracing/tracing/value/histogram.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+using ::testing::DoubleNear;
+using ::testing::Eq;
+using ::testing::Test;
+
+namespace proto = ::catapult::tracing::tracing::proto;
+
+std::map<std::string, std::string> DefaultMetadata() {
+  return std::map<std::string, std::string>{{"key", "value"}};
+}
+
+Metric::TimeSeries::Sample Sample(double value) {
+  return Metric::TimeSeries::Sample{.timestamp = Timestamp::Seconds(1),
+                                    .value = value,
+                                    .sample_metadata = DefaultMetadata()};
+}
+
+std::string ReadFileAsString(const std::string& filename) {
+  std::ifstream infile(filename, std::ios_base::binary);
+  auto buffer = std::vector<char>(std::istreambuf_iterator<char>(infile),
+                                  std::istreambuf_iterator<char>());
+  return std::string(buffer.begin(), buffer.end());
+}
+
+class ChromePerfDashboardMetricsExporterTest : public Test {
+ protected:
+  ~ChromePerfDashboardMetricsExporterTest() override = default;
+
+  void SetUp() override {
+    temp_filename_ = webrtc::test::TempFilename(
+        webrtc::test::OutputPath(),
+        "chrome_perf_dashboard_metrics_exporter_test");
+  }
+
+  void TearDown() override {
+    ASSERT_TRUE(webrtc::test::RemoveFile(temp_filename_));
+  }
+
+  std::string temp_filename_;
+};
+
+TEST_F(ChromePerfDashboardMetricsExporterTest, ExportMetricFormatCorrect) {
+  Metric metric1{
+      .name = "test_metric1",
+      .unit = Unit::kMilliseconds,
+      .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+      .test_case = "test_case_name1",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(10), Sample(20)}},
+      .stats =
+          Metric::Stats{.mean = 15.0, .stddev = 5.0, .min = 10.0, .max = 20.0}};
+  Metric metric2{
+      .name = "test_metric2",
+      .unit = Unit::kKilobitsPerSecond,
+      .improvement_direction = ImprovementDirection::kSmallerIsBetter,
+      .test_case = "test_case_name2",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(20), Sample(40)}},
+      .stats = Metric::Stats{
+          .mean = 30.0, .stddev = 10.0, .min = 20.0, .max = 40.0}};
+
+  ChromePerfDashboardMetricsExporter exporter(temp_filename_);
+
+  ASSERT_TRUE(exporter.Export(std::vector<Metric>{metric1, metric2}));
+  proto::HistogramSet actual_histogram_set;
+  actual_histogram_set.ParseFromString(ReadFileAsString(temp_filename_));
+  EXPECT_THAT(actual_histogram_set.histograms().size(), Eq(2));
+
+  // Validate output for `metric1`
+  EXPECT_THAT(actual_histogram_set.histograms(0).name(), Eq("test_metric1"));
+  EXPECT_THAT(actual_histogram_set.histograms(0).unit().unit(),
+              Eq(proto::Unit::MS_BEST_FIT_FORMAT));
+  EXPECT_THAT(actual_histogram_set.histograms(0).unit().improvement_direction(),
+              Eq(proto::ImprovementDirection::BIGGER_IS_BETTER));
+  EXPECT_THAT(
+      actual_histogram_set.histograms(0).diagnostics().diagnostic_map().size(),
+      Eq(1lu));
+  EXPECT_THAT(actual_histogram_set.histograms(0)
+                  .diagnostics()
+                  .diagnostic_map()
+                  .at("stories")
+                  .generic_set()
+                  .values(0),
+              Eq("\"test_case_name1\""));
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values().size(), Eq(2));
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values(0), Eq(10.0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values(1), Eq(20.0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().count(), Eq(2));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().max(), Eq(20));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().meanlogs(),
+              DoubleNear(2.64916, 0.1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().mean(), Eq(15));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().min(), Eq(10));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().sum(), Eq(30));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().variance(), Eq(50));
+
+  // Validate output for `metric2`
+  EXPECT_THAT(actual_histogram_set.histograms(1).name(), Eq("test_metric2"));
+  EXPECT_THAT(actual_histogram_set.histograms(1).unit().unit(),
+              Eq(proto::Unit::BYTES_PER_SECOND));
+  EXPECT_THAT(actual_histogram_set.histograms(1).unit().improvement_direction(),
+              Eq(proto::ImprovementDirection::SMALLER_IS_BETTER));
+  EXPECT_THAT(
+      actual_histogram_set.histograms(1).diagnostics().diagnostic_map().size(),
+      Eq(1lu));
+  EXPECT_THAT(actual_histogram_set.histograms(1)
+                  .diagnostics()
+                  .diagnostic_map()
+                  .at("stories")
+                  .generic_set()
+                  .values(0),
+              Eq("\"test_case_name2\""));
+  EXPECT_THAT(actual_histogram_set.histograms(1).sample_values().size(), Eq(2));
+  EXPECT_THAT(actual_histogram_set.histograms(1).sample_values(0), Eq(2500.0));
+  EXPECT_THAT(actual_histogram_set.histograms(1).sample_values(1), Eq(5000.0));
+  EXPECT_THAT(actual_histogram_set.histograms(1).running().count(), Eq(2));
+  EXPECT_THAT(actual_histogram_set.histograms(1).running().max(), Eq(5000));
+  EXPECT_THAT(actual_histogram_set.histograms(1).running().meanlogs(),
+              DoubleNear(8.17062, 0.1));
+  EXPECT_THAT(actual_histogram_set.histograms(1).running().mean(), Eq(3750));
+  EXPECT_THAT(actual_histogram_set.histograms(1).running().min(), Eq(2500));
+  EXPECT_THAT(actual_histogram_set.histograms(1).running().sum(), Eq(7500));
+  EXPECT_THAT(actual_histogram_set.histograms(1).running().variance(),
+              Eq(3125000));
+}
+
+TEST_F(ChromePerfDashboardMetricsExporterTest,
+       ExportEmptyMetricExportsZeroValue) {
+  Metric metric{.name = "test_metric",
+                .unit = Unit::kMilliseconds,
+                .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+                .test_case = "test_case_name",
+                .metric_metadata = DefaultMetadata(),
+                .time_series = Metric::TimeSeries{.samples = {}},
+                .stats = Metric::Stats{}};
+
+  ChromePerfDashboardMetricsExporter exporter(temp_filename_);
+
+  ASSERT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  proto::HistogramSet actual_histogram_set;
+  actual_histogram_set.ParseFromString(ReadFileAsString(temp_filename_));
+  EXPECT_THAT(actual_histogram_set.histograms().size(), Eq(1));
+
+  // Validate values for `metric`
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values().size(), Eq(1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values(0), Eq(0.0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().count(), Eq(1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().max(),
+              DoubleNear(0, 1e-6));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().meanlogs(), Eq(0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().mean(), Eq(0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().min(), Eq(0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().sum(), Eq(0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().variance(), Eq(0));
+}
+
+TEST_F(ChromePerfDashboardMetricsExporterTest,
+       ExportMetricWithOnlyStatsExportsMeanValues) {
+  Metric metric{.name = "test_metric",
+                .unit = Unit::kMilliseconds,
+                .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+                .test_case = "test_case_name",
+                .metric_metadata = DefaultMetadata(),
+                .time_series = Metric::TimeSeries{.samples = {}},
+                .stats = Metric::Stats{
+                    .mean = 15.0, .stddev = 5.0, .min = 10.0, .max = 20.0}};
+
+  ChromePerfDashboardMetricsExporter exporter(temp_filename_);
+
+  ASSERT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  proto::HistogramSet actual_histogram_set;
+  actual_histogram_set.ParseFromString(ReadFileAsString(temp_filename_));
+  EXPECT_THAT(actual_histogram_set.histograms().size(), Eq(1));
+
+  // Validate values for `metric`
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values().size(), Eq(1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values(0), Eq(15.0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().count(), Eq(1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().max(), Eq(15));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().meanlogs(),
+              DoubleNear(2.70805, 0.1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().mean(), Eq(15));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().min(), Eq(15));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().sum(), Eq(15));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().variance(), Eq(0));
+}
+
+TEST_F(ChromePerfDashboardMetricsExporterTest,
+       ExportMetricWithOnlyStatsConvertsMeanValuesWhenRequired) {
+  Metric metric{.name = "test_metric",
+                .unit = Unit::kKilobitsPerSecond,
+                .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+                .test_case = "test_case_name",
+                .metric_metadata = DefaultMetadata(),
+                .time_series = Metric::TimeSeries{.samples = {}},
+                .stats = Metric::Stats{
+                    .mean = 15.0, .stddev = 5.0, .min = 10.0, .max = 20.0}};
+
+  ChromePerfDashboardMetricsExporter exporter(temp_filename_);
+
+  ASSERT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  proto::HistogramSet actual_histogram_set;
+  actual_histogram_set.ParseFromString(ReadFileAsString(temp_filename_));
+  EXPECT_THAT(actual_histogram_set.histograms().size(), Eq(1));
+
+  // Validate values for `metric`
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values().size(), Eq(1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).sample_values(0), Eq(1875.0));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().count(), Eq(1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().max(), Eq(1875));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().meanlogs(),
+              DoubleNear(7.53636, 0.1));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().mean(), Eq(1875));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().min(), Eq(1875));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().sum(), Eq(1875));
+  EXPECT_THAT(actual_histogram_set.histograms(0).running().variance(), Eq(0));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter.cc b/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter.cc
new file mode 100644
index 0000000000..2d42a976aa
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter.cc
@@ -0,0 +1,42 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/global_metrics_logger_and_exporter.h"
+
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "api/test/metrics/metrics_exporter.h"
+#include "api/test/metrics/metrics_logger.h"
+#include "rtc_base/checks.h"
+#include "system_wrappers/include/clock.h"
+
+namespace webrtc {
+namespace test {
+
+DefaultMetricsLogger* GetGlobalMetricsLogger() {
+  static DefaultMetricsLogger* logger_ =
+      new DefaultMetricsLogger(Clock::GetRealTimeClock());
+  return logger_;
+}
+
+bool ExportPerfMetric(MetricsLogger& logger,
+                      std::vector<std::unique_ptr<MetricsExporter>> exporters) {
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  bool success = true;
+  for (auto& exporter : exporters) {
+    bool export_result = exporter->Export(metrics);
+    success = success && export_result;
+  }
+  return success;
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter.h b/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter.h
new file mode 100644
index 0000000000..f77ff1c737
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter.h
@@ -0,0 +1,32 @@
+/*
+ *  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_GLOBAL_METRICS_LOGGER_AND_EXPORTER_H_
+#define API_TEST_METRICS_GLOBAL_METRICS_LOGGER_AND_EXPORTER_H_
+
+#include <memory>
+#include <vector>
+
+#include "api/test/metrics/metrics_exporter.h"
+#include "api/test/metrics/metrics_logger.h"
+
+namespace webrtc {
+namespace test {
+
+// Returns non-null global `MetricsLogger` to log metrics.
+DefaultMetricsLogger* GetGlobalMetricsLogger();
+
+bool ExportPerfMetric(MetricsLogger& logger,
+                      std::vector<std::unique_ptr<MetricsExporter>> exporters);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_GLOBAL_METRICS_LOGGER_AND_EXPORTER_H_
diff --git a/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter_test.cc b/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter_test.cc
new file mode 100644
index 0000000000..567b3da9e3
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/global_metrics_logger_and_exporter_test.cc
@@ -0,0 +1,131 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/global_metrics_logger_and_exporter.h"
+
+#include <map>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/test/metrics/metric.h"
+#include "api/test/metrics/metrics_exporter.h"
+#include "api/test/metrics/metrics_logger.h"
+#include "system_wrappers/include/clock.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+using ::testing::Eq;
+using ::testing::IsEmpty;
+
+std::map<std::string, std::string> DefaultMetadata() {
+  return std::map<std::string, std::string>{{"key", "value"}};
+}
+
+struct TestMetricsExporterFactory {
+ public:
+  std::unique_ptr<MetricsExporter> CreateExporter() {
+    return std::make_unique<TestMetricsExporter>(this, /*export_result=*/true);
+  }
+
+  std::unique_ptr<MetricsExporter> CreateFailureExporter() {
+    return std::make_unique<TestMetricsExporter>(this, /*export_result=*/false);
+  }
+
+  std::vector<Metric> exported_metrics;
+
+ private:
+  class TestMetricsExporter : public MetricsExporter {
+   public:
+    TestMetricsExporter(TestMetricsExporterFactory* factory, bool export_result)
+        : factory_(factory), export_result_(export_result) {}
+    ~TestMetricsExporter() override = default;
+
+    bool Export(rtc::ArrayView<const Metric> metrics) override {
+      factory_->exported_metrics =
+          std::vector<Metric>(metrics.begin(), metrics.end());
+      return export_result_;
+    }
+
+    TestMetricsExporterFactory* factory_;
+    bool export_result_;
+  };
+};
+
+TEST(ExportPerfMetricTest, CollectedMetricsAreExporter) {
+  TestMetricsExporterFactory exporter_factory;
+
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  logger.LogSingleValueMetric(
+      "metric_name", "test_case_name",
+      /*value=*/10, Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+      std::map<std::string, std::string>{{"key", "value"}});
+
+  std::vector<std::unique_ptr<MetricsExporter>> exporters;
+  exporters.push_back(exporter_factory.CreateExporter());
+  ASSERT_TRUE(ExportPerfMetric(logger, std::move(exporters)));
+
+  std::vector<Metric> metrics = exporter_factory.exported_metrics;
+  ASSERT_THAT(metrics.size(), Eq(1lu));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key", "value"}}));
+  ASSERT_THAT(metric.time_series.samples.size(), Eq(1lu));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.stddev, absl::nullopt);
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(10.0));
+}
+
+TEST(ExportPerfMetricTest, OneFailedExporterDoesNotPreventExportToOthers) {
+  TestMetricsExporterFactory exporter_factory1;
+  TestMetricsExporterFactory exporter_factory2;
+  TestMetricsExporterFactory exporter_factory3;
+
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  logger.LogSingleValueMetric("metric_name", "test_case_name",
+                              /*value=*/10, Unit::kMilliseconds,
+                              ImprovementDirection::kBiggerIsBetter,
+                              DefaultMetadata());
+
+  std::vector<std::unique_ptr<MetricsExporter>> exporters;
+  exporters.push_back(exporter_factory1.CreateExporter());
+  exporters.push_back(exporter_factory2.CreateFailureExporter());
+  exporters.push_back(exporter_factory3.CreateExporter());
+  ASSERT_FALSE(ExportPerfMetric(logger, std::move(exporters)));
+
+  std::vector<Metric> metrics1 = exporter_factory1.exported_metrics;
+  std::vector<Metric> metrics2 = exporter_factory2.exported_metrics;
+  std::vector<Metric> metrics3 = exporter_factory3.exported_metrics;
+  ASSERT_THAT(metrics1.size(), Eq(1lu))
+      << metrics1[0].name << "; " << metrics1[1].name;
+  EXPECT_THAT(metrics1[0].name, Eq("metric_name"));
+  ASSERT_THAT(metrics2.size(), Eq(1lu));
+  EXPECT_THAT(metrics2[0].name, Eq("metric_name"));
+  ASSERT_THAT(metrics3.size(), Eq(1lu));
+  EXPECT_THAT(metrics3[0].name, Eq("metric_name"));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/metric.cc b/third_party/libwebrtc/api/test/metrics/metric.cc
new file mode 100644
index 0000000000..3c30f36f49
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metric.cc
@@ -0,0 +1,48 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/metric.h"
+
+#include <string>
+
+namespace webrtc {
+namespace test {
+
+absl::string_view ToString(Unit unit) {
+  switch (unit) {
+    case Unit::kMilliseconds:
+      return "Milliseconds";
+    case Unit::kPercent:
+      return "Percent";
+    case Unit::kBytes:
+      return "Bytes";
+    case Unit::kKilobitsPerSecond:
+      return "KilobitsPerSecond";
+    case Unit::kHertz:
+      return "Hertz";
+    case Unit::kUnitless:
+      return "Unitless";
+    case Unit::kCount:
+      return "Count";
+  }
+}
+
+absl::string_view ToString(ImprovementDirection direction) {
+  switch (direction) {
+    case ImprovementDirection::kBiggerIsBetter:
+      return "BiggerIsBetter";
+    case ImprovementDirection::kNeitherIsBetter:
+      return "NeitherIsBetter";
+    case ImprovementDirection::kSmallerIsBetter:
+      return "SmallerIsBetter";
+  }
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/metric.h b/third_party/libwebrtc/api/test/metrics/metric.h
new file mode 100644
index 0000000000..17c1755f95
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metric.h
@@ -0,0 +1,96 @@
+/*
+ *  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_
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_accumulator.cc b/third_party/libwebrtc/api/test/metrics/metrics_accumulator.cc
new file mode 100644
index 0000000000..c34396be97
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_accumulator.cc
@@ -0,0 +1,132 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/metrics_accumulator.h"
+
+#include <map>
+#include <string>
+#include <utility>
+#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"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+Metric::Stats ToStats(const SamplesStatsCounter& values) {
+  if (values.IsEmpty()) {
+    return Metric::Stats();
+  }
+  return Metric::Stats{.mean = values.GetAverage(),
+                       .stddev = values.GetStandardDeviation(),
+                       .min = values.GetMin(),
+                       .max = values.GetMax()};
+}
+
+Metric SetTimeseries(const Metric& prototype,
+                     const SamplesStatsCounter& counter) {
+  Metric output(prototype);
+  Metric::TimeSeries time_series;
+  for (const SamplesStatsCounter::StatsSample& sample :
+       counter.GetTimedSamples()) {
+    time_series.samples.push_back(
+        Metric::TimeSeries::Sample{.timestamp = sample.time,
+                                   .value = sample.value,
+                                   .sample_metadata = sample.metadata});
+  }
+  output.time_series = std::move(time_series);
+  output.stats = ToStats(counter);
+  return output;
+}
+
+}  // namespace
+
+bool operator<(const MetricsAccumulator::MetricKey& a,
+               const MetricsAccumulator::MetricKey& b) {
+  if (a.test_case_name < b.test_case_name) {
+    return true;
+  } else if (a.test_case_name > b.test_case_name) {
+    return false;
+  } else {
+    return a.metric_name < b.metric_name;
+  }
+}
+
+bool MetricsAccumulator::AddSample(
+    absl::string_view metric_name,
+    absl::string_view test_case_name,
+    double value,
+    Timestamp timestamp,
+    std::map<std::string, std::string> point_metadata) {
+  MutexLock lock(&mutex_);
+  bool created;
+  MetricValue* metric_value =
+      GetOrCreateMetric(metric_name, test_case_name, &created);
+  metric_value->counter.AddSample(
+      SamplesStatsCounter::StatsSample{.value = value,
+                                       .time = timestamp,
+                                       .metadata = std::move(point_metadata)});
+  return created;
+}
+
+bool MetricsAccumulator::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) {
+  MutexLock lock(&mutex_);
+  bool created;
+  MetricValue* metric_value =
+      GetOrCreateMetric(metric_name, test_case_name, &created);
+  metric_value->metric.unit = unit;
+  metric_value->metric.improvement_direction = improvement_direction;
+  metric_value->metric.metric_metadata = std::move(metric_metadata);
+  return created;
+}
+
+std::vector<Metric> MetricsAccumulator::GetCollectedMetrics() const {
+  MutexLock lock(&mutex_);
+  std::vector<Metric> out;
+  out.reserve(metrics_.size());
+  for (const auto& [unused_key, metric_value] : metrics_) {
+    out.push_back(SetTimeseries(metric_value.metric, metric_value.counter));
+  }
+  return out;
+}
+
+MetricsAccumulator::MetricValue* MetricsAccumulator::GetOrCreateMetric(
+    absl::string_view metric_name,
+    absl::string_view test_case_name,
+    bool* created) {
+  MetricKey key(metric_name, test_case_name);
+  auto it = metrics_.find(key);
+  if (it != metrics_.end()) {
+    *created = false;
+    return &it->second;
+  }
+  *created = true;
+
+  Metric metric{
+      .name = key.metric_name,
+      .unit = Unit::kUnitless,
+      .improvement_direction = ImprovementDirection::kNeitherIsBetter,
+      .test_case = key.test_case_name,
+  };
+  return &metrics_.emplace(key, MetricValue{.metric = std::move(metric)})
+              .first->second;
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_accumulator.h b/third_party/libwebrtc/api/test/metrics/metrics_accumulator.h
new file mode 100644
index 0000000000..c75bd9429c
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_accumulator.h
@@ -0,0 +1,99 @@
+/*
+ *  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_
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_accumulator_test.cc b/third_party/libwebrtc/api/test/metrics/metrics_accumulator_test.cc
new file mode 100644
index 0000000000..677f523339
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_accumulator_test.cc
@@ -0,0 +1,315 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/metrics_accumulator.h"
+
+#include <map>
+#include <vector>
+
+#include "api/test/metrics/metric.h"
+#include "api/units/timestamp.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+using ::testing::Eq;
+using ::testing::IsEmpty;
+using ::testing::SizeIs;
+
+TEST(MetricsAccumulatorTest, AddSampleToTheNewMetricWillCreateOne) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddSample(
+      "metric_name", "test_case_name",
+      /*value=*/10, Timestamp::Seconds(1),
+      /*point_metadata=*/std::map<std::string, std::string>{{"key", "value"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kUnitless));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kNeitherIsBetter));
+  EXPECT_THAT(metric.metric_metadata, IsEmpty());
+  ASSERT_THAT(metric.time_series.samples, SizeIs(1));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(1)));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key", "value"}}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.stddev, absl::optional<double>(0.0));
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(10.0));
+}
+
+TEST(MetricsAccumulatorTest, AddSamplesToExistingMetricWontCreateNewOne) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddSample(
+      "metric_name", "test_case_name",
+      /*value=*/10, Timestamp::Seconds(1),
+      /*point_metadata=*/
+      std::map<std::string, std::string>{{"key1", "value1"}}));
+  ASSERT_FALSE(accumulator.AddSample(
+      "metric_name", "test_case_name",
+      /*value=*/20, Timestamp::Seconds(2),
+      /*point_metadata=*/
+      std::map<std::string, std::string>{{"key2", "value2"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kUnitless));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kNeitherIsBetter));
+  EXPECT_THAT(metric.metric_metadata, IsEmpty());
+  ASSERT_THAT(metric.time_series.samples, SizeIs(2));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(1)));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key1", "value1"}}));
+  EXPECT_THAT(metric.time_series.samples[1].value, Eq(20.0));
+  EXPECT_THAT(metric.time_series.samples[1].timestamp,
+              Eq(Timestamp::Seconds(2)));
+  EXPECT_THAT(metric.time_series.samples[1].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key2", "value2"}}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(15.0));
+  ASSERT_THAT(metric.stats.stddev, absl::optional<double>(5.0));
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(20.0));
+}
+
+TEST(MetricsAccumulatorTest, AddSampleToDifferentMetricsWillCreateBoth) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddSample(
+      "metric_name1", "test_case_name1",
+      /*value=*/10, Timestamp::Seconds(1),
+      /*point_metadata=*/
+      std::map<std::string, std::string>{{"key1", "value1"}}));
+  ASSERT_TRUE(accumulator.AddSample(
+      "metric_name2", "test_case_name2",
+      /*value=*/20, Timestamp::Seconds(2),
+      /*point_metadata=*/
+      std::map<std::string, std::string>{{"key2", "value2"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(2));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name1"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name1"));
+  EXPECT_THAT(metrics[0].unit, Eq(Unit::kUnitless));
+  EXPECT_THAT(metrics[0].improvement_direction,
+              Eq(ImprovementDirection::kNeitherIsBetter));
+  EXPECT_THAT(metrics[0].metric_metadata, IsEmpty());
+  ASSERT_THAT(metrics[0].time_series.samples, SizeIs(1));
+  EXPECT_THAT(metrics[0].time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metrics[0].time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(1)));
+  EXPECT_THAT(metrics[0].time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key1", "value1"}}));
+  ASSERT_THAT(metrics[0].stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metrics[0].stats.stddev, absl::optional<double>(0.0));
+  ASSERT_THAT(metrics[0].stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metrics[0].stats.max, absl::optional<double>(10.0));
+  EXPECT_THAT(metrics[1].name, Eq("metric_name2"));
+  EXPECT_THAT(metrics[1].test_case, Eq("test_case_name2"));
+  EXPECT_THAT(metrics[1].unit, Eq(Unit::kUnitless));
+  EXPECT_THAT(metrics[1].improvement_direction,
+              Eq(ImprovementDirection::kNeitherIsBetter));
+  EXPECT_THAT(metrics[1].metric_metadata, IsEmpty());
+  ASSERT_THAT(metrics[1].time_series.samples, SizeIs(1));
+  EXPECT_THAT(metrics[1].time_series.samples[0].value, Eq(20.0));
+  EXPECT_THAT(metrics[1].time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(2)));
+  EXPECT_THAT(metrics[1].time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key2", "value2"}}));
+  ASSERT_THAT(metrics[1].stats.mean, absl::optional<double>(20.0));
+  ASSERT_THAT(metrics[1].stats.stddev, absl::optional<double>(0.0));
+  ASSERT_THAT(metrics[1].stats.min, absl::optional<double>(20.0));
+  ASSERT_THAT(metrics[1].stats.max, absl::optional<double>(20.0));
+}
+
+TEST(MetricsAccumulatorTest, AddMetadataToTheNewMetricWillCreateOne) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddMetricMetadata(
+      "metric_name", "test_case_name", Unit::kMilliseconds,
+      ImprovementDirection::kBiggerIsBetter,
+      /*metric_metadata=*/
+      std::map<std::string, std::string>{{"key", "value"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key", "value"}}));
+  ASSERT_THAT(metric.time_series.samples, IsEmpty());
+  ASSERT_THAT(metric.stats.mean, absl::nullopt);
+  ASSERT_THAT(metric.stats.stddev, absl::nullopt);
+  ASSERT_THAT(metric.stats.min, absl::nullopt);
+  ASSERT_THAT(metric.stats.max, absl::nullopt);
+}
+
+TEST(MetricsAccumulatorTest,
+     AddMetadataToTheExistingMetricWillOverwriteValues) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddMetricMetadata(
+      "metric_name", "test_case_name", Unit::kMilliseconds,
+      ImprovementDirection::kBiggerIsBetter,
+      /*metric_metadata=*/
+      std::map<std::string, std::string>{{"key1", "value1"}}));
+
+  ASSERT_FALSE(accumulator.AddMetricMetadata(
+      "metric_name", "test_case_name", Unit::kBytes,
+      ImprovementDirection::kSmallerIsBetter,
+      /*metric_metadata=*/
+      std::map<std::string, std::string>{{"key2", "value2"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kBytes));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kSmallerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key2", "value2"}}));
+  ASSERT_THAT(metric.time_series.samples, IsEmpty());
+  ASSERT_THAT(metric.stats.mean, absl::nullopt);
+  ASSERT_THAT(metric.stats.stddev, absl::nullopt);
+  ASSERT_THAT(metric.stats.min, absl::nullopt);
+  ASSERT_THAT(metric.stats.max, absl::nullopt);
+}
+
+TEST(MetricsAccumulatorTest, AddMetadataToDifferentMetricsWillCreateBoth) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddMetricMetadata(
+      "metric_name1", "test_case_name1", Unit::kMilliseconds,
+      ImprovementDirection::kBiggerIsBetter,
+      /*metric_metadata=*/
+      std::map<std::string, std::string>{{"key1", "value1"}}));
+
+  ASSERT_TRUE(accumulator.AddMetricMetadata(
+      "metric_name2", "test_case_name2", Unit::kBytes,
+      ImprovementDirection::kSmallerIsBetter,
+      /*metric_metadata=*/
+      std::map<std::string, std::string>{{"key2", "value2"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(2));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name1"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name1"));
+  EXPECT_THAT(metrics[0].unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metrics[0].improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metrics[0].metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key1", "value1"}}));
+  ASSERT_THAT(metrics[0].time_series.samples, IsEmpty());
+  ASSERT_THAT(metrics[0].stats.mean, absl::nullopt);
+  ASSERT_THAT(metrics[0].stats.stddev, absl::nullopt);
+  ASSERT_THAT(metrics[0].stats.min, absl::nullopt);
+  ASSERT_THAT(metrics[0].stats.max, absl::nullopt);
+  EXPECT_THAT(metrics[1].name, Eq("metric_name2"));
+  EXPECT_THAT(metrics[1].test_case, Eq("test_case_name2"));
+  EXPECT_THAT(metrics[1].unit, Eq(Unit::kBytes));
+  EXPECT_THAT(metrics[1].improvement_direction,
+              Eq(ImprovementDirection::kSmallerIsBetter));
+  EXPECT_THAT(metrics[1].metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key2", "value2"}}));
+  ASSERT_THAT(metrics[1].time_series.samples, IsEmpty());
+  ASSERT_THAT(metrics[1].stats.mean, absl::nullopt);
+  ASSERT_THAT(metrics[1].stats.stddev, absl::nullopt);
+  ASSERT_THAT(metrics[1].stats.min, absl::nullopt);
+  ASSERT_THAT(metrics[1].stats.max, absl::nullopt);
+}
+
+TEST(MetricsAccumulatorTest, AddMetadataAfterAddingSampleWontCreateNewMetric) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddSample(
+      "metric_name", "test_case_name",
+      /*value=*/10, Timestamp::Seconds(1),
+      /*point_metadata=*/
+      std::map<std::string, std::string>{{"key_s", "value_s"}}));
+  ASSERT_FALSE(accumulator.AddMetricMetadata(
+      "metric_name", "test_case_name", Unit::kMilliseconds,
+      ImprovementDirection::kBiggerIsBetter,
+      /*metric_metadata=*/
+      std::map<std::string, std::string>{{"key_m", "value_m"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key_m", "value_m"}}));
+  ASSERT_THAT(metric.time_series.samples, SizeIs(1));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(1)));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key_s", "value_s"}}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.stddev, absl::optional<double>(0.0));
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(10.0));
+}
+
+TEST(MetricsAccumulatorTest, AddSampleAfterAddingMetadataWontCreateNewMetric) {
+  MetricsAccumulator accumulator;
+  ASSERT_TRUE(accumulator.AddMetricMetadata(
+      "metric_name", "test_case_name", Unit::kMilliseconds,
+      ImprovementDirection::kBiggerIsBetter,
+      /*metric_metadata=*/
+      std::map<std::string, std::string>{{"key_m", "value_m"}}));
+  ASSERT_FALSE(accumulator.AddSample(
+      "metric_name", "test_case_name",
+      /*value=*/10, Timestamp::Seconds(1),
+      /*point_metadata=*/
+      std::map<std::string, std::string>{{"key_s", "value_s"}}));
+
+  std::vector<Metric> metrics = accumulator.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key_m", "value_m"}}));
+  ASSERT_THAT(metric.time_series.samples, SizeIs(1));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(1)));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key_s", "value_s"}}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.stddev, absl::optional<double>(0.0));
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(10.0));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_exporter.h b/third_party/libwebrtc/api/test/metrics/metrics_exporter.h
new file mode 100644
index 0000000000..23954b6b1f
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_exporter.h
@@ -0,0 +1,33 @@
+/*
+ *  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_EXPORTER_H_
+#define API_TEST_METRICS_METRICS_EXPORTER_H_
+
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+
+namespace webrtc {
+namespace test {
+
+// Exports metrics in the requested format.
+class MetricsExporter {
+ public:
+  virtual ~MetricsExporter() = default;
+
+  // Exports specified metrics in a format that depends on the implementation.
+  // Returns true if export succeeded, false otherwise.
+  virtual bool Export(rtc::ArrayView<const Metric> metrics) = 0;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_METRICS_EXPORTER_H_
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_logger.cc b/third_party/libwebrtc/api/test/metrics/metrics_logger.cc
new file mode 100644
index 0000000000..1e24400367
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_logger.cc
@@ -0,0 +1,114 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/metrics_logger.h"
+
+#include <map>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/numerics/samples_stats_counter.h"
+#include "api/test/metrics/metric.h"
+#include "rtc_base/synchronization/mutex.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+Metric::Stats ToStats(const SamplesStatsCounter& values) {
+  if (values.IsEmpty()) {
+    return Metric::Stats();
+  }
+  return Metric::Stats{.mean = values.GetAverage(),
+                       .stddev = values.GetStandardDeviation(),
+                       .min = values.GetMin(),
+                       .max = values.GetMax()};
+}
+
+}  // namespace
+
+void DefaultMetricsLogger::LogSingleValueMetric(
+    absl::string_view name,
+    absl::string_view test_case_name,
+    double value,
+    Unit unit,
+    ImprovementDirection improvement_direction,
+    std::map<std::string, std::string> metadata) {
+  MutexLock lock(&mutex_);
+  metrics_.push_back(Metric{
+      .name = std::string(name),
+      .unit = unit,
+      .improvement_direction = improvement_direction,
+      .test_case = std::string(test_case_name),
+      .metric_metadata = std::move(metadata),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Metric::TimeSeries::Sample{
+                                 .timestamp = Now(), .value = value}}},
+      .stats = Metric::Stats{
+          .mean = value, .stddev = absl::nullopt, .min = value, .max = value}});
+}
+
+void DefaultMetricsLogger::LogMetric(
+    absl::string_view name,
+    absl::string_view test_case_name,
+    const SamplesStatsCounter& values,
+    Unit unit,
+    ImprovementDirection improvement_direction,
+    std::map<std::string, std::string> metadata) {
+  MutexLock lock(&mutex_);
+  Metric::TimeSeries time_series;
+  for (const SamplesStatsCounter::StatsSample& sample :
+       values.GetTimedSamples()) {
+    time_series.samples.push_back(
+        Metric::TimeSeries::Sample{.timestamp = sample.time,
+                                   .value = sample.value,
+                                   .sample_metadata = sample.metadata});
+  }
+
+  metrics_.push_back(Metric{.name = std::string(name),
+                            .unit = unit,
+                            .improvement_direction = improvement_direction,
+                            .test_case = std::string(test_case_name),
+                            .metric_metadata = std::move(metadata),
+                            .time_series = std::move(time_series),
+                            .stats = ToStats(values)});
+}
+
+void DefaultMetricsLogger::LogMetric(
+    absl::string_view name,
+    absl::string_view test_case_name,
+    const Metric::Stats& metric_stats,
+    Unit unit,
+    ImprovementDirection improvement_direction,
+    std::map<std::string, std::string> metadata) {
+  MutexLock lock(&mutex_);
+  metrics_.push_back(Metric{.name = std::string(name),
+                            .unit = unit,
+                            .improvement_direction = improvement_direction,
+                            .test_case = std::string(test_case_name),
+                            .metric_metadata = std::move(metadata),
+                            .time_series = Metric::TimeSeries{.samples = {}},
+                            .stats = std::move(metric_stats)});
+}
+
+std::vector<Metric> DefaultMetricsLogger::GetCollectedMetrics() const {
+  std::vector<Metric> out = metrics_accumulator_.GetCollectedMetrics();
+  MutexLock lock(&mutex_);
+  out.insert(out.end(), metrics_.begin(), metrics_.end());
+  return out;
+}
+
+Timestamp DefaultMetricsLogger::Now() {
+  return clock_->CurrentTime();
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_logger.h b/third_party/libwebrtc/api/test/metrics/metrics_logger.h
new file mode 100644
index 0000000000..66f9e55b95
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_logger.h
@@ -0,0 +1,112 @@
+/*
+ *  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_LOGGER_H_
+#define API_TEST_METRICS_METRICS_LOGGER_H_
+
+#include <map>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/numerics/samples_stats_counter.h"
+#include "api/test/metrics/metric.h"
+#include "api/test/metrics/metrics_accumulator.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "system_wrappers/include/clock.h"
+
+namespace webrtc {
+namespace test {
+
+// Provides API to log and collect performance metrics.
+class MetricsLogger {
+ public:
+  virtual ~MetricsLogger() = default;
+
+  // Adds a metric with a single value.
+  // `metadata` - metric's level metadata to add.
+  virtual void LogSingleValueMetric(
+      absl::string_view name,
+      absl::string_view test_case_name,
+      double value,
+      Unit unit,
+      ImprovementDirection improvement_direction,
+      std::map<std::string, std::string> metadata = {}) = 0;
+
+  // Adds metrics with a time series created based on the provided `values`.
+  // `metadata` - metric's level metadata to add.
+  virtual void LogMetric(absl::string_view name,
+                         absl::string_view test_case_name,
+                         const SamplesStatsCounter& values,
+                         Unit unit,
+                         ImprovementDirection improvement_direction,
+                         std::map<std::string, std::string> metadata = {}) = 0;
+
+  // Adds metric with a time series with only stats object and without actual
+  // collected values.
+  // `metadata` - metric's level metadata to add.
+  virtual void LogMetric(absl::string_view name,
+                         absl::string_view test_case_name,
+                         const Metric::Stats& metric_stats,
+                         Unit unit,
+                         ImprovementDirection improvement_direction,
+                         std::map<std::string, std::string> metadata = {}) = 0;
+
+  // Returns all metrics collected by this logger.
+  virtual std::vector<Metric> GetCollectedMetrics() const = 0;
+};
+
+class DefaultMetricsLogger : public MetricsLogger {
+ public:
+  explicit DefaultMetricsLogger(webrtc::Clock* clock) : clock_(clock) {}
+  ~DefaultMetricsLogger() override = default;
+
+  void LogSingleValueMetric(
+      absl::string_view name,
+      absl::string_view test_case_name,
+      double value,
+      Unit unit,
+      ImprovementDirection improvement_direction,
+      std::map<std::string, std::string> metadata = {}) override;
+
+  void LogMetric(absl::string_view name,
+                 absl::string_view test_case_name,
+                 const SamplesStatsCounter& values,
+                 Unit unit,
+                 ImprovementDirection improvement_direction,
+                 std::map<std::string, std::string> metadata = {}) override;
+
+  void LogMetric(absl::string_view name,
+                 absl::string_view test_case_name,
+                 const Metric::Stats& metric_stats,
+                 Unit unit,
+                 ImprovementDirection improvement_direction,
+                 std::map<std::string, std::string> metadata = {}) override;
+
+  // Returns all metrics collected by this logger and its `MetricsAccumulator`.
+  std::vector<Metric> GetCollectedMetrics() const override;
+
+  MetricsAccumulator* GetMetricsAccumulator() { return &metrics_accumulator_; }
+
+ private:
+  webrtc::Timestamp Now();
+
+  webrtc::Clock* const clock_;
+  MetricsAccumulator metrics_accumulator_;
+
+  mutable Mutex mutex_;
+  std::vector<Metric> metrics_ RTC_GUARDED_BY(mutex_);
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_METRICS_LOGGER_H_
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_logger_test.cc b/third_party/libwebrtc/api/test/metrics/metrics_logger_test.cc
new file mode 100644
index 0000000000..de4501ca36
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_logger_test.cc
@@ -0,0 +1,326 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/metrics_logger.h"
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/numerics/samples_stats_counter.h"
+#include "api/test/metrics/metric.h"
+#include "system_wrappers/include/clock.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+using ::testing::Eq;
+using ::testing::IsEmpty;
+using ::testing::SizeIs;
+
+std::map<std::string, std::string> DefaultMetadata() {
+  return std::map<std::string, std::string>{{"key", "value"}};
+}
+
+TEST(DefaultMetricsLoggerTest, LogSingleValueMetricRecordsMetric) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  logger.LogSingleValueMetric(
+      "metric_name", "test_case_name",
+      /*value=*/10, Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+      std::map<std::string, std::string>{{"key", "value"}});
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key", "value"}}));
+  ASSERT_THAT(metric.time_series.samples, SizeIs(1));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.stddev, absl::nullopt);
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(10.0));
+}
+
+TEST(DefaultMetricsLoggerTest, LogMetricWithSamplesStatsCounterRecordsMetric) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+
+  SamplesStatsCounter values;
+  values.AddSample(SamplesStatsCounter::StatsSample{
+      .value = 10,
+      .time = Clock::GetRealTimeClock()->CurrentTime(),
+      .metadata =
+          std::map<std::string, std::string>{{"point_key1", "value1"}}});
+  values.AddSample(SamplesStatsCounter::StatsSample{
+      .value = 20,
+      .time = Clock::GetRealTimeClock()->CurrentTime(),
+      .metadata =
+          std::map<std::string, std::string>{{"point_key2", "value2"}}});
+  logger.LogMetric("metric_name", "test_case_name", values, Unit::kMilliseconds,
+                   ImprovementDirection::kBiggerIsBetter,
+                   std::map<std::string, std::string>{{"key", "value"}});
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key", "value"}}));
+  ASSERT_THAT(metric.time_series.samples, SizeIs(2));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"point_key1", "value1"}}));
+  EXPECT_THAT(metric.time_series.samples[1].value, Eq(20.0));
+  EXPECT_THAT(metric.time_series.samples[1].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"point_key2", "value2"}}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(15.0));
+  ASSERT_THAT(metric.stats.stddev, absl::optional<double>(5.0));
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(20.0));
+}
+
+TEST(DefaultMetricsLoggerTest,
+     LogMetricWithEmptySamplesStatsCounterRecordsEmptyMetric) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  SamplesStatsCounter values;
+  logger.LogMetric("metric_name", "test_case_name", values, Unit::kUnitless,
+                   ImprovementDirection::kBiggerIsBetter, DefaultMetadata());
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name"));
+  EXPECT_THAT(metrics[0].time_series.samples, IsEmpty());
+  ASSERT_THAT(metrics[0].stats.mean, Eq(absl::nullopt));
+  ASSERT_THAT(metrics[0].stats.stddev, Eq(absl::nullopt));
+  ASSERT_THAT(metrics[0].stats.min, Eq(absl::nullopt));
+  ASSERT_THAT(metrics[0].stats.max, Eq(absl::nullopt));
+}
+
+TEST(DefaultMetricsLoggerTest, LogMetricWithStatsRecordsMetric) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  Metric::Stats metric_stats{.mean = 15, .stddev = 5, .min = 10, .max = 20};
+  logger.LogMetric("metric_name", "test_case_name", metric_stats,
+                   Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+                   std::map<std::string, std::string>{{"key", "value"}});
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metric.metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key", "value"}}));
+  ASSERT_THAT(metric.time_series.samples, IsEmpty());
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(15.0));
+  ASSERT_THAT(metric.stats.stddev, absl::optional<double>(5.0));
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(20.0));
+}
+
+TEST(DefaultMetricsLoggerTest, LogSingleValueMetricRecordsMultipleMetrics) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+
+  logger.LogSingleValueMetric("metric_name1", "test_case_name1",
+                              /*value=*/10, Unit::kMilliseconds,
+                              ImprovementDirection::kBiggerIsBetter,
+                              DefaultMetadata());
+  logger.LogSingleValueMetric("metric_name2", "test_case_name2",
+                              /*value=*/10, Unit::kMilliseconds,
+                              ImprovementDirection::kBiggerIsBetter,
+                              DefaultMetadata());
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(2));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name1"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name1"));
+  EXPECT_THAT(metrics[1].name, Eq("metric_name2"));
+  EXPECT_THAT(metrics[1].test_case, Eq("test_case_name2"));
+}
+
+TEST(DefaultMetricsLoggerTest,
+     LogMetricWithSamplesStatsCounterRecordsMultipleMetrics) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  SamplesStatsCounter values;
+  values.AddSample(SamplesStatsCounter::StatsSample{
+      .value = 10,
+      .time = Clock::GetRealTimeClock()->CurrentTime(),
+      .metadata = DefaultMetadata()});
+  values.AddSample(SamplesStatsCounter::StatsSample{
+      .value = 20,
+      .time = Clock::GetRealTimeClock()->CurrentTime(),
+      .metadata = DefaultMetadata()});
+
+  logger.LogMetric("metric_name1", "test_case_name1", values,
+                   Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+                   DefaultMetadata());
+  logger.LogMetric("metric_name2", "test_case_name2", values,
+                   Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+                   DefaultMetadata());
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(2));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name1"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name1"));
+  EXPECT_THAT(metrics[1].name, Eq("metric_name2"));
+  EXPECT_THAT(metrics[1].test_case, Eq("test_case_name2"));
+}
+
+TEST(DefaultMetricsLoggerTest, LogMetricWithStatsRecordsMultipleMetrics) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  Metric::Stats metric_stats{.mean = 15, .stddev = 5, .min = 10, .max = 20};
+
+  logger.LogMetric("metric_name1", "test_case_name1", metric_stats,
+                   Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+                   DefaultMetadata());
+  logger.LogMetric("metric_name2", "test_case_name2", metric_stats,
+                   Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+                   DefaultMetadata());
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(2));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name1"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name1"));
+  EXPECT_THAT(metrics[1].name, Eq("metric_name2"));
+  EXPECT_THAT(metrics[1].test_case, Eq("test_case_name2"));
+}
+
+TEST(DefaultMetricsLoggerTest,
+     LogMetricThroughtAllMethodsAccumulateAllMetrics) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  SamplesStatsCounter values;
+  values.AddSample(SamplesStatsCounter::StatsSample{
+      .value = 10,
+      .time = Clock::GetRealTimeClock()->CurrentTime(),
+      .metadata = DefaultMetadata()});
+  values.AddSample(SamplesStatsCounter::StatsSample{
+      .value = 20,
+      .time = Clock::GetRealTimeClock()->CurrentTime(),
+      .metadata = DefaultMetadata()});
+  Metric::Stats metric_stats{.mean = 15, .stddev = 5, .min = 10, .max = 20};
+
+  logger.LogSingleValueMetric("metric_name1", "test_case_name1",
+                              /*value=*/10, Unit::kMilliseconds,
+                              ImprovementDirection::kBiggerIsBetter,
+                              DefaultMetadata());
+  logger.LogMetric("metric_name2", "test_case_name2", values,
+                   Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+                   DefaultMetadata());
+  logger.LogMetric("metric_name3", "test_case_name3", metric_stats,
+                   Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+                   DefaultMetadata());
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics.size(), Eq(3lu));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name1"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name1"));
+  EXPECT_THAT(metrics[1].name, Eq("metric_name2"));
+  EXPECT_THAT(metrics[1].test_case, Eq("test_case_name2"));
+  EXPECT_THAT(metrics[2].name, Eq("metric_name3"));
+  EXPECT_THAT(metrics[2].test_case, Eq("test_case_name3"));
+}
+
+TEST(DefaultMetricsLoggerTest, AccumulatedMetricsReturnedInCollectedMetrics) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  logger.GetMetricsAccumulator()->AddSample(
+      "metric_name", "test_case_name",
+      /*value=*/10, Timestamp::Seconds(1),
+      /*point_metadata=*/std::map<std::string, std::string>{{"key", "value"}});
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(1));
+  const Metric& metric = metrics[0];
+  EXPECT_THAT(metric.name, Eq("metric_name"));
+  EXPECT_THAT(metric.test_case, Eq("test_case_name"));
+  EXPECT_THAT(metric.unit, Eq(Unit::kUnitless));
+  EXPECT_THAT(metric.improvement_direction,
+              Eq(ImprovementDirection::kNeitherIsBetter));
+  EXPECT_THAT(metric.metric_metadata, IsEmpty());
+  ASSERT_THAT(metric.time_series.samples, SizeIs(1));
+  EXPECT_THAT(metric.time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metric.time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(1)));
+  EXPECT_THAT(metric.time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key", "value"}}));
+  ASSERT_THAT(metric.stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.stddev, absl::optional<double>(0.0));
+  ASSERT_THAT(metric.stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metric.stats.max, absl::optional<double>(10.0));
+}
+
+TEST(DefaultMetricsLoggerTest,
+     AccumulatedMetricsReturnedTogetherWithLoggedMetrics) {
+  DefaultMetricsLogger logger(Clock::GetRealTimeClock());
+  logger.LogSingleValueMetric(
+      "metric_name1", "test_case_name1",
+      /*value=*/10, Unit::kMilliseconds, ImprovementDirection::kBiggerIsBetter,
+      std::map<std::string, std::string>{{"key_m", "value_m"}});
+  logger.GetMetricsAccumulator()->AddSample(
+      "metric_name2", "test_case_name2",
+      /*value=*/10, Timestamp::Seconds(1),
+      /*point_metadata=*/
+      std::map<std::string, std::string>{{"key_s", "value_s"}});
+
+  std::vector<Metric> metrics = logger.GetCollectedMetrics();
+  ASSERT_THAT(metrics, SizeIs(2));
+  EXPECT_THAT(metrics[0].name, Eq("metric_name2"));
+  EXPECT_THAT(metrics[0].test_case, Eq("test_case_name2"));
+  EXPECT_THAT(metrics[0].unit, Eq(Unit::kUnitless));
+  EXPECT_THAT(metrics[0].improvement_direction,
+              Eq(ImprovementDirection::kNeitherIsBetter));
+  EXPECT_THAT(metrics[0].metric_metadata, IsEmpty());
+  ASSERT_THAT(metrics[0].time_series.samples, SizeIs(1));
+  EXPECT_THAT(metrics[0].time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metrics[0].time_series.samples[0].timestamp,
+              Eq(Timestamp::Seconds(1)));
+  EXPECT_THAT(metrics[0].time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{{"key_s", "value_s"}}));
+  ASSERT_THAT(metrics[0].stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metrics[0].stats.stddev, absl::optional<double>(0.0));
+  ASSERT_THAT(metrics[0].stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metrics[0].stats.max, absl::optional<double>(10.0));
+  EXPECT_THAT(metrics[1].name, Eq("metric_name1"));
+  EXPECT_THAT(metrics[1].test_case, Eq("test_case_name1"));
+  EXPECT_THAT(metrics[1].unit, Eq(Unit::kMilliseconds));
+  EXPECT_THAT(metrics[1].improvement_direction,
+              Eq(ImprovementDirection::kBiggerIsBetter));
+  EXPECT_THAT(metrics[1].metric_metadata,
+              Eq(std::map<std::string, std::string>{{"key_m", "value_m"}}));
+  ASSERT_THAT(metrics[1].time_series.samples, SizeIs(1));
+  EXPECT_THAT(metrics[1].time_series.samples[0].value, Eq(10.0));
+  EXPECT_THAT(metrics[1].time_series.samples[0].sample_metadata,
+              Eq(std::map<std::string, std::string>{}));
+  ASSERT_THAT(metrics[1].stats.mean, absl::optional<double>(10.0));
+  ASSERT_THAT(metrics[1].stats.stddev, absl::nullopt);
+  ASSERT_THAT(metrics[1].stats.min, absl::optional<double>(10.0));
+  ASSERT_THAT(metrics[1].stats.max, absl::optional<double>(10.0));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter.cc b/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter.cc
new file mode 100644
index 0000000000..86e6f2e136
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter.cc
@@ -0,0 +1,157 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/metrics_set_proto_file_exporter.h"
+
+#include <stdio.h>
+
+#include <string>
+
+#include "api/test/metrics/metric.h"
+#include "rtc_base/logging.h"
+#include "test/testsupport/file_utils.h"
+
+#if WEBRTC_ENABLE_PROTOBUF
+#include "api/test/metrics/proto/metric.pb.h"
+#endif
+
+namespace webrtc {
+namespace test {
+namespace {
+
+#if WEBRTC_ENABLE_PROTOBUF
+webrtc::test_metrics::Unit ToProtoUnit(Unit unit) {
+  switch (unit) {
+    case Unit::kMilliseconds:
+      return webrtc::test_metrics::Unit::MILLISECONDS;
+    case Unit::kPercent:
+      return webrtc::test_metrics::Unit::PERCENT;
+    case Unit::kBytes:
+      return webrtc::test_metrics::Unit::BYTES;
+    case Unit::kKilobitsPerSecond:
+      return webrtc::test_metrics::Unit::KILOBITS_PER_SECOND;
+    case Unit::kHertz:
+      return webrtc::test_metrics::Unit::HERTZ;
+    case Unit::kUnitless:
+      return webrtc::test_metrics::Unit::UNITLESS;
+    case Unit::kCount:
+      return webrtc::test_metrics::Unit::COUNT;
+  }
+}
+
+webrtc::test_metrics::ImprovementDirection ToProtoImprovementDirection(
+    ImprovementDirection direction) {
+  switch (direction) {
+    case ImprovementDirection::kBiggerIsBetter:
+      return webrtc::test_metrics::ImprovementDirection::BIGGER_IS_BETTER;
+    case ImprovementDirection::kNeitherIsBetter:
+      return webrtc::test_metrics::ImprovementDirection::NEITHER_IS_BETTER;
+    case ImprovementDirection::kSmallerIsBetter:
+      return webrtc::test_metrics::ImprovementDirection::SMALLER_IS_BETTER;
+  }
+}
+
+void SetTimeSeries(
+    const Metric::TimeSeries& time_series,
+    webrtc::test_metrics::Metric::TimeSeries* proto_time_series) {
+  for (const Metric::TimeSeries::Sample& sample : time_series.samples) {
+    webrtc::test_metrics::Metric::TimeSeries::Sample* proto_sample =
+        proto_time_series->add_samples();
+    proto_sample->set_value(sample.value);
+    proto_sample->set_timestamp_us(sample.timestamp.us());
+    for (const auto& [key, value] : sample.sample_metadata) {
+      proto_sample->mutable_sample_metadata()->insert({key, value});
+    }
+  }
+}
+
+void SetStats(const Metric::Stats& stats,
+              webrtc::test_metrics::Metric::Stats* proto_stats) {
+  if (stats.mean.has_value()) {
+    proto_stats->set_mean(*stats.mean);
+  }
+  if (stats.stddev.has_value()) {
+    proto_stats->set_stddev(*stats.stddev);
+  }
+  if (stats.min.has_value()) {
+    proto_stats->set_min(*stats.min);
+  }
+  if (stats.max.has_value()) {
+    proto_stats->set_max(*stats.max);
+  }
+}
+
+bool WriteMetricsToFile(const std::string& path,
+                        const webrtc::test_metrics::MetricsSet& metrics_set) {
+  std::string data;
+  bool ok = metrics_set.SerializeToString(&data);
+  if (!ok) {
+    RTC_LOG(LS_ERROR) << "Failed to serialize histogram set to string";
+    return false;
+  }
+
+  CreateDir(DirName(path));
+  FILE* output = fopen(path.c_str(), "wb");
+  if (output == NULL) {
+    RTC_LOG(LS_ERROR) << "Failed to write to " << path;
+    return false;
+  }
+  size_t written = fwrite(data.c_str(), sizeof(char), data.size(), output);
+  fclose(output);
+
+  if (written != data.size()) {
+    size_t expected = data.size();
+    RTC_LOG(LS_ERROR) << "Wrote " << written << ", tried to write " << expected;
+    return false;
+  }
+  return true;
+}
+#endif  // WEBRTC_ENABLE_PROTOBUF
+
+}  // namespace
+
+MetricsSetProtoFileExporter::Options::Options(
+    absl::string_view export_file_path)
+    : export_file_path(export_file_path) {}
+MetricsSetProtoFileExporter::Options::Options(
+    absl::string_view export_file_path,
+    bool export_whole_time_series)
+    : export_file_path(export_file_path),
+      export_whole_time_series(export_whole_time_series) {}
+
+bool MetricsSetProtoFileExporter::Export(rtc::ArrayView<const Metric> metrics) {
+#if WEBRTC_ENABLE_PROTOBUF
+  webrtc::test_metrics::MetricsSet metrics_set;
+  for (const Metric& metric : metrics) {
+    webrtc::test_metrics::Metric* metric_proto = metrics_set.add_metrics();
+    metric_proto->set_name(metric.name);
+    metric_proto->set_unit(ToProtoUnit(metric.unit));
+    metric_proto->set_improvement_direction(
+        ToProtoImprovementDirection(metric.improvement_direction));
+    metric_proto->set_test_case(metric.test_case);
+    for (const auto& [key, value] : metric.metric_metadata) {
+      metric_proto->mutable_metric_metadata()->insert({key, value});
+    }
+
+    if (options_.export_whole_time_series) {
+      SetTimeSeries(metric.time_series, metric_proto->mutable_time_series());
+    }
+    SetStats(metric.stats, metric_proto->mutable_stats());
+  }
+
+  return WriteMetricsToFile(options_.export_file_path, metrics_set);
+#else
+  RTC_LOG(LS_ERROR)
+      << "Compile with protobuf support to properly use this class";
+  return false;
+#endif
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter.h b/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter.h
new file mode 100644
index 0000000000..f996e9e7b0
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter.h
@@ -0,0 +1,54 @@
+/*
+ *  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_SET_PROTO_FILE_EXPORTER_H_
+#define API_TEST_METRICS_METRICS_SET_PROTO_FILE_EXPORTER_H_
+
+#include <string>
+
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+#include "api/test/metrics/metrics_exporter.h"
+
+namespace webrtc {
+namespace test {
+
+// Exports all collected metrics to the proto file using
+// `webrtc::test_metrics::MetricsSet` format.
+class MetricsSetProtoFileExporter : public MetricsExporter {
+ public:
+  struct Options {
+    explicit Options(absl::string_view export_file_path);
+    Options(absl::string_view export_file_path, bool export_whole_time_series);
+
+    // File to export proto.
+    std::string export_file_path;
+    // If true will write all time series values to the output proto file,
+    // otherwise will write stats only.
+    bool export_whole_time_series = true;
+  };
+
+  explicit MetricsSetProtoFileExporter(const Options& options)
+      : options_(options) {}
+
+  MetricsSetProtoFileExporter(const MetricsSetProtoFileExporter&) = delete;
+  MetricsSetProtoFileExporter& operator=(const MetricsSetProtoFileExporter&) =
+      delete;
+
+  bool Export(rtc::ArrayView<const Metric> metrics) override;
+
+ private:
+  const Options options_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_METRICS_SET_PROTO_FILE_EXPORTER_H_
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter_test.cc b/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter_test.cc
new file mode 100644
index 0000000000..eb4d483068
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_set_proto_file_exporter_test.cc
@@ -0,0 +1,151 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/metrics_set_proto_file_exporter.h"
+
+#include <fstream>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "api/test/metrics/metric.h"
+#include "api/test/metrics/proto/metric.pb.h"
+#include "api/units/timestamp.h"
+#include "rtc_base/protobuf_utils.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+#include "test/testsupport/file_utils.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+using ::testing::Eq;
+using ::testing::Test;
+
+namespace proto = ::webrtc::test_metrics;
+
+std::string ReadFileAsString(const std::string& filename) {
+  std::ifstream infile(filename, std::ios_base::binary);
+  auto buffer = std::vector<char>(std::istreambuf_iterator<char>(infile),
+                                  std::istreambuf_iterator<char>());
+  return std::string(buffer.begin(), buffer.end());
+}
+
+std::map<std::string, std::string> DefaultMetadata() {
+  return std::map<std::string, std::string>{{"key", "value"}};
+}
+
+Metric::TimeSeries::Sample Sample(double value) {
+  return Metric::TimeSeries::Sample{.timestamp = Timestamp::Seconds(1),
+                                    .value = value,
+                                    .sample_metadata = DefaultMetadata()};
+}
+
+void AssertSamplesEqual(const proto::Metric::TimeSeries::Sample& actual_sample,
+                        const Metric::TimeSeries::Sample& expected_sample) {
+  EXPECT_THAT(actual_sample.value(), Eq(expected_sample.value));
+  EXPECT_THAT(actual_sample.timestamp_us(), Eq(expected_sample.timestamp.us()));
+  EXPECT_THAT(actual_sample.sample_metadata().size(),
+              Eq(expected_sample.sample_metadata.size()));
+  for (const auto& [key, value] : expected_sample.sample_metadata) {
+    EXPECT_THAT(actual_sample.sample_metadata().at(key), Eq(value));
+  }
+}
+
+class MetricsSetProtoFileExporterTest : public Test {
+ protected:
+  ~MetricsSetProtoFileExporterTest() override = default;
+
+  void SetUp() override {
+    temp_filename_ = webrtc::test::TempFilename(
+        webrtc::test::OutputPath(), "metrics_set_proto_file_exporter_test");
+  }
+
+  void TearDown() override {
+    ASSERT_TRUE(webrtc::test::RemoveFile(temp_filename_));
+  }
+
+  std::string temp_filename_;
+};
+
+TEST_F(MetricsSetProtoFileExporterTest, MetricsAreExportedCorrectly) {
+  MetricsSetProtoFileExporter::Options options(temp_filename_);
+  MetricsSetProtoFileExporter exporter(options);
+
+  Metric metric1{
+      .name = "test_metric1",
+      .unit = Unit::kMilliseconds,
+      .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+      .test_case = "test_case_name1",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(10), Sample(20)}},
+      .stats =
+          Metric::Stats{.mean = 15.0, .stddev = 5.0, .min = 10.0, .max = 20.0}};
+  Metric metric2{
+      .name = "test_metric2",
+      .unit = Unit::kKilobitsPerSecond,
+      .improvement_direction = ImprovementDirection::kSmallerIsBetter,
+      .test_case = "test_case_name2",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(20), Sample(40)}},
+      .stats = Metric::Stats{
+          .mean = 30.0, .stddev = 10.0, .min = 20.0, .max = 40.0}};
+
+  ASSERT_TRUE(exporter.Export(std::vector<Metric>{metric1, metric2}));
+  webrtc::test_metrics::MetricsSet actual_metrics_set;
+  actual_metrics_set.ParseFromString(ReadFileAsString(temp_filename_));
+  EXPECT_THAT(actual_metrics_set.metrics().size(), Eq(2));
+
+  EXPECT_THAT(actual_metrics_set.metrics(0).name(), Eq("test_metric1"));
+  EXPECT_THAT(actual_metrics_set.metrics(0).test_case(), Eq("test_case_name1"));
+  EXPECT_THAT(actual_metrics_set.metrics(0).unit(),
+              Eq(proto::Unit::MILLISECONDS));
+  EXPECT_THAT(actual_metrics_set.metrics(0).improvement_direction(),
+              Eq(proto::ImprovementDirection::BIGGER_IS_BETTER));
+  EXPECT_THAT(actual_metrics_set.metrics(0).metric_metadata().size(), Eq(1lu));
+  EXPECT_THAT(actual_metrics_set.metrics(0).metric_metadata().at("key"),
+              Eq("value"));
+  EXPECT_THAT(actual_metrics_set.metrics(0).time_series().samples().size(),
+              Eq(2));
+  AssertSamplesEqual(actual_metrics_set.metrics(0).time_series().samples(0),
+                     Sample(10.0));
+  AssertSamplesEqual(actual_metrics_set.metrics(0).time_series().samples(1),
+                     Sample(20.0));
+  EXPECT_THAT(actual_metrics_set.metrics(0).stats().mean(), Eq(15.0));
+  EXPECT_THAT(actual_metrics_set.metrics(0).stats().stddev(), Eq(5.0));
+  EXPECT_THAT(actual_metrics_set.metrics(0).stats().min(), Eq(10.0));
+  EXPECT_THAT(actual_metrics_set.metrics(0).stats().max(), Eq(20.0));
+
+  EXPECT_THAT(actual_metrics_set.metrics(1).name(), Eq("test_metric2"));
+  EXPECT_THAT(actual_metrics_set.metrics(1).test_case(), Eq("test_case_name2"));
+  EXPECT_THAT(actual_metrics_set.metrics(1).unit(),
+              Eq(proto::Unit::KILOBITS_PER_SECOND));
+  EXPECT_THAT(actual_metrics_set.metrics(1).improvement_direction(),
+              Eq(proto::ImprovementDirection::SMALLER_IS_BETTER));
+  EXPECT_THAT(actual_metrics_set.metrics(1).metric_metadata().size(), Eq(1lu));
+  EXPECT_THAT(actual_metrics_set.metrics(1).metric_metadata().at("key"),
+              Eq("value"));
+  EXPECT_THAT(actual_metrics_set.metrics(1).time_series().samples().size(),
+              Eq(2));
+  AssertSamplesEqual(actual_metrics_set.metrics(1).time_series().samples(0),
+                     Sample(20.0));
+  AssertSamplesEqual(actual_metrics_set.metrics(1).time_series().samples(1),
+                     Sample(40.0));
+  EXPECT_THAT(actual_metrics_set.metrics(1).stats().mean(), Eq(30.0));
+  EXPECT_THAT(actual_metrics_set.metrics(1).stats().stddev(), Eq(10.0));
+  EXPECT_THAT(actual_metrics_set.metrics(1).stats().min(), Eq(20.0));
+  EXPECT_THAT(actual_metrics_set.metrics(1).stats().max(), Eq(40.0));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter.cc b/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter.cc
new file mode 100644
index 0000000000..1ce1e63892
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter.cc
@@ -0,0 +1,157 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/print_result_proxy_metrics_exporter.h"
+
+#include <string>
+#include <unordered_set>
+
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+#include "test/testsupport/perf_test.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+std::string ToPrintResultUnit(Unit unit) {
+  switch (unit) {
+    case Unit::kMilliseconds:
+      return "msBestFitFormat";
+    case Unit::kPercent:
+      return "n%";
+    case Unit::kBytes:
+      return "sizeInBytes";
+    case Unit::kKilobitsPerSecond:
+      // PrintResults prefer Chrome Perf Dashboard units, which doesn't have
+      // kpbs units, so we change the unit and value accordingly.
+      return "bytesPerSecond";
+    case Unit::kHertz:
+      return "Hz";
+    case Unit::kUnitless:
+      return "unitless";
+    case Unit::kCount:
+      return "count";
+  }
+}
+
+double ToPrintResultValue(double value, Unit unit) {
+  switch (unit) {
+    case Unit::kKilobitsPerSecond:
+      // PrintResults prefer Chrome Perf Dashboard units, which doesn't have
+      // kpbs units, so we change the unit and value accordingly.
+      return value * 1000 / 8;
+    default:
+      return value;
+  }
+}
+
+ImproveDirection ToPrintResultImproveDirection(ImprovementDirection direction) {
+  switch (direction) {
+    case ImprovementDirection::kBiggerIsBetter:
+      return ImproveDirection::kBiggerIsBetter;
+    case ImprovementDirection::kNeitherIsBetter:
+      return ImproveDirection::kNone;
+    case ImprovementDirection::kSmallerIsBetter:
+      return ImproveDirection::kSmallerIsBetter;
+  }
+}
+
+bool IsEmpty(const Metric::Stats& stats) {
+  return !stats.mean.has_value() && !stats.stddev.has_value() &&
+         !stats.min.has_value() && !stats.max.has_value();
+}
+
+bool NameEndsWithConnected(const std::string& name) {
+  static const std::string suffix = "_connected";
+  return name.size() >= suffix.size() &&
+         0 == name.compare(name.size() - suffix.size(), suffix.size(), suffix);
+}
+
+}  // namespace
+
+bool PrintResultProxyMetricsExporter::Export(
+    rtc::ArrayView<const Metric> metrics) {
+  static const std::unordered_set<std::string> per_call_metrics{
+      "actual_encode_bitrate",
+      "encode_frame_rate",
+      "harmonic_framerate",
+      "max_skipped",
+      "min_psnr_dB",
+      "retransmission_bitrate",
+      "sent_packets_loss",
+      "transmission_bitrate",
+      "dropped_frames",
+      "frames_in_flight",
+      "rendered_frames",
+      "average_receive_rate",
+      "average_send_rate",
+      "bytes_discarded_no_receiver",
+      "bytes_received",
+      "bytes_sent",
+      "packets_discarded_no_receiver",
+      "packets_received",
+      "packets_sent",
+      "payload_bytes_received",
+      "payload_bytes_sent",
+      "cpu_usage"};
+
+  for (const Metric& metric : metrics) {
+    if (metric.time_series.samples.empty() && IsEmpty(metric.stats)) {
+      // If there were no data collected for the metric it is expected that 0
+      // will be exported, so add 0 to the samples.
+      PrintResult(metric.name, /*modifier=*/"", metric.test_case,
+                  ToPrintResultValue(0, metric.unit),
+                  ToPrintResultUnit(metric.unit), /*important=*/false,
+                  ToPrintResultImproveDirection(metric.improvement_direction));
+      continue;
+    }
+
+    if (metric.time_series.samples.empty()) {
+      PrintResultMeanAndError(
+          metric.name, /*modifier=*/"", metric.test_case,
+          ToPrintResultValue(*metric.stats.mean, metric.unit),
+          ToPrintResultValue(*metric.stats.stddev, metric.unit),
+          ToPrintResultUnit(metric.unit),
+          /*important=*/false,
+          ToPrintResultImproveDirection(metric.improvement_direction));
+      continue;
+    }
+
+    if (metric.time_series.samples.size() == 1lu &&
+        (per_call_metrics.count(metric.name) > 0 ||
+         NameEndsWithConnected(metric.name))) {
+      // Increase backwards compatibility for 1 value use case.
+      PrintResult(
+          metric.name, /*modifier=*/"", metric.test_case,
+          ToPrintResultValue(metric.time_series.samples[0].value, metric.unit),
+          ToPrintResultUnit(metric.unit), /*important=*/false,
+          ToPrintResultImproveDirection(metric.improvement_direction));
+      continue;
+    }
+
+    SamplesStatsCounter counter;
+    for (size_t i = 0; i < metric.time_series.samples.size(); ++i) {
+      counter.AddSample(SamplesStatsCounter::StatsSample{
+          .value = ToPrintResultValue(metric.time_series.samples[i].value,
+                                      metric.unit),
+          .time = metric.time_series.samples[i].timestamp,
+          .metadata = metric.time_series.samples[i].sample_metadata});
+    }
+
+    PrintResult(metric.name, /*modifier=*/"", metric.test_case, counter,
+                ToPrintResultUnit(metric.unit),
+                /*important=*/false,
+                ToPrintResultImproveDirection(metric.improvement_direction));
+  }
+  return true;
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter.h b/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter.h
new file mode 100644
index 0000000000..bad0594972
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter.h
@@ -0,0 +1,32 @@
+/*
+ *  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_PRINT_RESULT_PROXY_METRICS_EXPORTER_H_
+#define API_TEST_METRICS_PRINT_RESULT_PROXY_METRICS_EXPORTER_H_
+
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+#include "api/test/metrics/metrics_exporter.h"
+
+namespace webrtc {
+namespace test {
+
+// Proxies all exported metrics to the `webrtc::test::PrintResult` API.
+class PrintResultProxyMetricsExporter : public MetricsExporter {
+ public:
+  ~PrintResultProxyMetricsExporter() override = default;
+
+  bool Export(rtc::ArrayView<const Metric> metrics) override;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_PRINT_RESULT_PROXY_METRICS_EXPORTER_H_
diff --git a/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter_test.cc b/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter_test.cc
new file mode 100644
index 0000000000..768c794b40
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/print_result_proxy_metrics_exporter_test.cc
@@ -0,0 +1,177 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/print_result_proxy_metrics_exporter.h"
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "api/test/metrics/metric.h"
+#include "api/units/timestamp.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+using ::testing::TestWithParam;
+
+std::map<std::string, std::string> DefaultMetadata() {
+  return std::map<std::string, std::string>{{"key", "value"}};
+}
+
+Metric::TimeSeries::Sample Sample(double value) {
+  return Metric::TimeSeries::Sample{.timestamp = Timestamp::Seconds(1),
+                                    .value = value,
+                                    .sample_metadata = DefaultMetadata()};
+}
+
+TEST(PrintResultProxyMetricsExporterTest,
+     ExportMetricsWithTimeSeriesFormatCorrect) {
+  Metric metric1{
+      .name = "test_metric1",
+      .unit = Unit::kMilliseconds,
+      .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+      .test_case = "test_case_name1",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(10), Sample(20)}},
+      .stats =
+          Metric::Stats{.mean = 15.0, .stddev = 5.0, .min = 10.0, .max = 20.0}};
+  Metric metric2{
+      .name = "test_metric2",
+      .unit = Unit::kKilobitsPerSecond,
+      .improvement_direction = ImprovementDirection::kSmallerIsBetter,
+      .test_case = "test_case_name2",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(20), Sample(40)}},
+      .stats = Metric::Stats{
+          .mean = 30.0, .stddev = 10.0, .min = 20.0, .max = 40.0}};
+
+  testing::internal::CaptureStdout();
+  PrintResultProxyMetricsExporter exporter;
+
+  std::string expected =
+      "RESULT test_metric1: test_case_name1= {15,5} "
+      "msBestFitFormat_biggerIsBetter\n"
+      "RESULT test_metric2: test_case_name2= {3750,1250} "
+      "bytesPerSecond_smallerIsBetter\n";
+
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric1, metric2}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(PrintResultProxyMetricsExporterTest,
+     ExportMetricsTimeSeriesOfSingleValueBackwardCompatibleFormat) {
+  // This should be printed as {mean, stddev} despite only being a single data
+  // point.
+  Metric metric1{
+      .name = "available_send_bandwidth",
+      .unit = Unit::kKilobitsPerSecond,
+      .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+      .test_case = "test_case/alice",
+      .metric_metadata = DefaultMetadata(),
+      .time_series = Metric::TimeSeries{.samples = std::vector{Sample(1000)}},
+      .stats = Metric::Stats{
+          .mean = 1000.0, .stddev = 0.0, .min = 1000.0, .max = 1000.0}};
+  // This is a per-call metric that shouldn't have a stddev estimate.
+  Metric metric2{
+      .name = "min_psnr_dB",
+      .unit = Unit::kUnitless,
+      .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+      .test_case = "test_case/alice-video",
+      .metric_metadata = DefaultMetadata(),
+      .time_series = Metric::TimeSeries{.samples = std::vector{Sample(10)}},
+      .stats =
+          Metric::Stats{.mean = 10.0, .stddev = 0.0, .min = 10.0, .max = 10.0}};
+  // This is a per-call metric that shouldn't have a stddev estimate.
+  Metric metric3{
+      .name = "alice_connected",
+      .unit = Unit::kUnitless,
+      .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+      .test_case = "test_case",
+      .metric_metadata = DefaultMetadata(),
+      .time_series = Metric::TimeSeries{.samples = std::vector{Sample(1)}},
+      .stats =
+          Metric::Stats{.mean = 1.0, .stddev = 0.0, .min = 1.0, .max = 1.0}};
+
+  testing::internal::CaptureStdout();
+  PrintResultProxyMetricsExporter exporter;
+
+  std::string expected =
+      "RESULT available_send_bandwidth: test_case/alice= {125000,0} "
+      "bytesPerSecond_biggerIsBetter\n"
+      "RESULT min_psnr_dB: test_case/alice-video= 10 "
+      "unitless_biggerIsBetter\n"
+      "RESULT alice_connected: test_case= 1 "
+      "unitless_biggerIsBetter\n";
+
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric1, metric2, metric3}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(PrintResultProxyMetricsExporterTest,
+     ExportMetricsWithStatsOnlyFormatCorrect) {
+  Metric metric1{.name = "test_metric1",
+                 .unit = Unit::kMilliseconds,
+                 .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+                 .test_case = "test_case_name1",
+                 .metric_metadata = DefaultMetadata(),
+                 .time_series = Metric::TimeSeries{.samples = {}},
+                 .stats = Metric::Stats{
+                     .mean = 15.0, .stddev = 5.0, .min = 10.0, .max = 20.0}};
+  Metric metric2{
+      .name = "test_metric2",
+      .unit = Unit::kKilobitsPerSecond,
+      .improvement_direction = ImprovementDirection::kSmallerIsBetter,
+      .test_case = "test_case_name2",
+      .metric_metadata = DefaultMetadata(),
+      .time_series = Metric::TimeSeries{.samples = {}},
+      .stats = Metric::Stats{
+          .mean = 30.0, .stddev = 10.0, .min = 20.0, .max = 40.0}};
+
+  testing::internal::CaptureStdout();
+  PrintResultProxyMetricsExporter exporter;
+
+  std::string expected =
+      "RESULT test_metric1: test_case_name1= {15,5} "
+      "msBestFitFormat_biggerIsBetter\n"
+      "RESULT test_metric2: test_case_name2= {3750,1250} "
+      "bytesPerSecond_smallerIsBetter\n";
+
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric1, metric2}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(PrintResultProxyMetricsExporterTest, ExportEmptyMetricOnlyFormatCorrect) {
+  Metric metric{.name = "test_metric",
+                .unit = Unit::kMilliseconds,
+                .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+                .test_case = "test_case_name",
+                .metric_metadata = DefaultMetadata(),
+                .time_series = Metric::TimeSeries{.samples = {}},
+                .stats = Metric::Stats{}};
+
+  testing::internal::CaptureStdout();
+  PrintResultProxyMetricsExporter exporter;
+
+  std::string expected =
+      "RESULT test_metric: test_case_name= 0 "
+      "msBestFitFormat_biggerIsBetter\n";
+
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/proto/metric.proto b/third_party/libwebrtc/api/test/metrics/proto/metric.proto
new file mode 100644
index 0000000000..cdd312589d
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/proto/metric.proto
@@ -0,0 +1,87 @@
+/*
+ *  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;
+}
diff --git a/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter.cc b/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter.cc
new file mode 100644
index 0000000000..22243e73e8
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter.cc
@@ -0,0 +1,101 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/stdout_metrics_exporter.h"
+
+#include <stdio.h>
+
+#include <cmath>
+#include <string>
+
+#include "absl/types/optional.h"
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+// Returns positive integral part of the number.
+int64_t IntegralPart(double value) {
+  return std::lround(std::floor(std::abs(value)));
+}
+
+void AppendWithPrecision(double value,
+                         int digits_after_comma,
+                         rtc::StringBuilder& out) {
+  int64_t multiplier = std::lround(std::pow(10, digits_after_comma));
+  int64_t integral_part = IntegralPart(value);
+  double decimal_part = std::abs(value) - integral_part;
+
+  // If decimal part has leading zeros then when it will be multiplied on
+  // `multiplier`, leading zeros will be lost. To preserve them we add "1"
+  // so then leading digit will be greater than 0 and won't be removed.
+  //
+  // During conversion to the string leading digit has to be stripped.
+  //
+  // Also due to rounding it may happen that leading digit may be incremented,
+  // like with `digits_after_comma` 3 number 1.9995 will be rounded to 2. In
+  // such case this increment has to be propagated to the `integral_part`.
+  int64_t decimal_holder = std::lround((1 + decimal_part) * multiplier);
+  if (decimal_holder >= 2 * multiplier) {
+    // Rounding incremented added leading digit, so we need to transfer 1 to
+    // integral part.
+    integral_part++;
+    decimal_holder -= multiplier;
+  }
+  // Remove trailing zeros.
+  while (decimal_holder % 10 == 0) {
+    decimal_holder /= 10;
+  }
+
+  // Print serialized number to output.
+  if (value < 0) {
+    out << "-";
+  }
+  out << integral_part;
+  if (decimal_holder != 1) {
+    out << "." << std::to_string(decimal_holder).substr(1, digits_after_comma);
+  }
+}
+
+}  // namespace
+
+StdoutMetricsExporter::StdoutMetricsExporter() : output_(stdout) {}
+
+bool StdoutMetricsExporter::Export(rtc::ArrayView<const Metric> metrics) {
+  for (const Metric& metric : metrics) {
+    PrintMetric(metric);
+  }
+  return true;
+}
+
+void StdoutMetricsExporter::PrintMetric(const Metric& metric) {
+  rtc::StringBuilder value_stream;
+  value_stream << metric.test_case << " / " << metric.name << "= {mean=";
+  if (metric.stats.mean.has_value()) {
+    AppendWithPrecision(*metric.stats.mean, 8, value_stream);
+  } else {
+    value_stream << "-";
+  }
+  value_stream << ", stddev=";
+  if (metric.stats.stddev.has_value()) {
+    AppendWithPrecision(*metric.stats.stddev, 8, value_stream);
+  } else {
+    value_stream << "-";
+  }
+  value_stream << "} " << ToString(metric.unit) << " ("
+               << ToString(metric.improvement_direction) << ")";
+
+  fprintf(output_, "RESULT: %s\n", value_stream.str().c_str());
+}
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter.h b/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter.h
new file mode 100644
index 0000000000..2c572cb2ea
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter.h
@@ -0,0 +1,41 @@
+/*
+ *  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_STDOUT_METRICS_EXPORTER_H_
+#define API_TEST_METRICS_STDOUT_METRICS_EXPORTER_H_
+
+#include "api/array_view.h"
+#include "api/test/metrics/metric.h"
+#include "api/test/metrics/metrics_exporter.h"
+
+namespace webrtc {
+namespace test {
+
+// Exports all collected metrics to stdout.
+class StdoutMetricsExporter : public MetricsExporter {
+ public:
+  StdoutMetricsExporter();
+  ~StdoutMetricsExporter() override = default;
+
+  StdoutMetricsExporter(const StdoutMetricsExporter&) = delete;
+  StdoutMetricsExporter& operator=(const StdoutMetricsExporter&) = delete;
+
+  bool Export(rtc::ArrayView<const Metric> metrics) override;
+
+ private:
+  void PrintMetric(const Metric& metric);
+
+  FILE* const output_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_METRICS_STDOUT_METRICS_EXPORTER_H_
diff --git a/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter_test.cc b/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter_test.cc
new file mode 100644
index 0000000000..91c06fac5b
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/stdout_metrics_exporter_test.cc
@@ -0,0 +1,211 @@
+/*
+ *  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.
+ */
+#include "api/test/metrics/stdout_metrics_exporter.h"
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "api/test/metrics/metric.h"
+#include "api/units/timestamp.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+using ::testing::TestWithParam;
+
+std::map<std::string, std::string> DefaultMetadata() {
+  return std::map<std::string, std::string>{{"key", "value"}};
+}
+
+Metric::TimeSeries::Sample Sample(double value) {
+  return Metric::TimeSeries::Sample{.timestamp = Timestamp::Seconds(1),
+                                    .value = value,
+                                    .sample_metadata = DefaultMetadata()};
+}
+
+Metric PsnrForTestFoo(double mean, double stddev) {
+  return Metric{.name = "psnr",
+                .unit = Unit::kUnitless,
+                .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+                .test_case = "foo",
+                .time_series = Metric::TimeSeries{},
+                .stats = Metric::Stats{.mean = mean, .stddev = stddev}};
+}
+
+TEST(StdoutMetricsExporterTest, ExportMetricFormatCorrect) {
+  Metric metric1{
+      .name = "test_metric1",
+      .unit = Unit::kMilliseconds,
+      .improvement_direction = ImprovementDirection::kBiggerIsBetter,
+      .test_case = "test_case_name1",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(10), Sample(20)}},
+      .stats =
+          Metric::Stats{.mean = 15.0, .stddev = 5.0, .min = 10.0, .max = 20.0}};
+  Metric metric2{
+      .name = "test_metric2",
+      .unit = Unit::kKilobitsPerSecond,
+      .improvement_direction = ImprovementDirection::kSmallerIsBetter,
+      .test_case = "test_case_name2",
+      .metric_metadata = DefaultMetadata(),
+      .time_series =
+          Metric::TimeSeries{.samples = std::vector{Sample(20), Sample(40)}},
+      .stats = Metric::Stats{
+          .mean = 30.0, .stddev = 10.0, .min = 20.0, .max = 40.0}};
+
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  std::string expected =
+      "RESULT: test_case_name1 / test_metric1= "
+      "{mean=15, stddev=5} Milliseconds (BiggerIsBetter)\n"
+      "RESULT: test_case_name2 / test_metric2= "
+      "{mean=30, stddev=10} KilobitsPerSecond (SmallerIsBetter)\n";
+
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric1, metric2}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest, PositiveNumberMaxPrecision) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(15.00000001, 0.00000001);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=15.00000001, stddev=0.00000001} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     PositiveNumberTrailingZeroNotAdded) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(15.12345, 0.12);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=15.12345, stddev=0.12} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     PositiveNumberTrailingZeroAreRemoved) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(15.123450000, 0.120000000);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=15.12345, stddev=0.12} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     PositiveNumberRoundsUpOnPrecisionCorrectly) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(15.000000009, 0.999999999);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=15.00000001, stddev=1} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     PositiveNumberRoundsDownOnPrecisionCorrectly) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(15.0000000049, 0.9999999949);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=15, stddev=0.99999999} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest, NegativeNumberMaxPrecision) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(-15.00000001, -0.00000001);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=-15.00000001, stddev=-0.00000001} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     NegativeNumberTrailingZeroNotAdded) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(-15.12345, -0.12);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=-15.12345, stddev=-0.12} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     NegativeNumberTrailingZeroAreRemoved) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(-15.123450000, -0.120000000);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=-15.12345, stddev=-0.12} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     NegativeNumberRoundsUpOnPrecisionCorrectly) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(-15.000000009, -0.999999999);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=-15.00000001, stddev=-1} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+TEST(StdoutMetricsExporterNumberFormatTest,
+     NegativeNumberRoundsDownOnPrecisionCorrectly) {
+  testing::internal::CaptureStdout();
+  StdoutMetricsExporter exporter;
+
+  Metric metric = PsnrForTestFoo(-15.0000000049, -0.9999999949);
+  std::string expected =
+      "RESULT: foo / psnr= "
+      "{mean=-15, stddev=-0.99999999} Unitless (BiggerIsBetter)\n";
+  EXPECT_TRUE(exporter.Export(std::vector<Metric>{metric}));
+  EXPECT_EQ(expected, testing::internal::GetCapturedStdout());
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace webrtc