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diff --git a/third_party/libwebrtc/rtc_base/numerics/sample_stats.h b/third_party/libwebrtc/rtc_base/numerics/sample_stats.h
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+/*
+ * Copyright (c) 2019 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 RTC_BASE_NUMERICS_SAMPLE_STATS_H_
+#define RTC_BASE_NUMERICS_SAMPLE_STATS_H_
+
+#include "api/numerics/samples_stats_counter.h"
+#include "api/units/data_rate.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
+
+namespace webrtc {
+template <typename T>
+class SampleStats;
+
+// TODO(srte): Merge this implementation with SamplesStatsCounter.
+template <>
+class SampleStats<double> : public SamplesStatsCounter {
+ public:
+ double Max();
+ double Mean();
+ double Median();
+ double Quantile(double quantile);
+ double Min();
+ double Variance();
+ double StandardDeviation();
+ int Count();
+};
+
+template <>
+class SampleStats<TimeDelta> {
+ public:
+ void AddSample(TimeDelta delta);
+ void AddSampleMs(double delta_ms);
+ void AddSamples(const SampleStats<TimeDelta>& other);
+ bool IsEmpty();
+ TimeDelta Max();
+ TimeDelta Mean();
+ TimeDelta Median();
+ TimeDelta Quantile(double quantile);
+ TimeDelta Min();
+ TimeDelta Variance();
+ TimeDelta StandardDeviation();
+ int Count();
+
+ private:
+ SampleStats<double> stats_;
+};
+
+template <>
+class SampleStats<DataRate> {
+ public:
+ void AddSample(DataRate rate);
+ void AddSampleBps(double rate_bps);
+ void AddSamples(const SampleStats<DataRate>& other);
+ bool IsEmpty();
+ DataRate Max();
+ DataRate Mean();
+ DataRate Median();
+ DataRate Quantile(double quantile);
+ DataRate Min();
+ DataRate Variance();
+ DataRate StandardDeviation();
+ int Count();
+
+ private:
+ SampleStats<double> stats_;
+};
+} // namespace webrtc
+
+#endif // RTC_BASE_NUMERICS_SAMPLE_STATS_H_