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diff --git a/third_party/libwebrtc/test/drifting_clock.h b/third_party/libwebrtc/test/drifting_clock.h
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+/*
+ *  Copyright (c) 2016 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 TEST_DRIFTING_CLOCK_H_
+#define TEST_DRIFTING_CLOCK_H_
+
+#include <stdint.h>
+
+#include "system_wrappers/include/clock.h"
+#include "system_wrappers/include/ntp_time.h"
+
+namespace webrtc {
+namespace test {
+class DriftingClock : public Clock {
+ public:
+  static constexpr float kNoDrift = 1.0f;
+
+  DriftingClock(Clock* clock, float speed);
+
+  static constexpr float PercentsFaster(float percent) {
+    return 1.0f + percent / 100.0f;
+  }
+  static constexpr float PercentsSlower(float percent) {
+    return 1.0f - percent / 100.0f;
+  }
+
+  Timestamp CurrentTime() override { return Drift(clock_->CurrentTime()); }
+  NtpTime ConvertTimestampToNtpTime(Timestamp timestamp) override {
+    return Drift(clock_->ConvertTimestampToNtpTime(timestamp));
+  }
+
+ private:
+  TimeDelta Drift() const;
+  Timestamp Drift(Timestamp timestamp) const;
+  NtpTime Drift(NtpTime ntp_time) const;
+
+  Clock* const clock_;
+  const float drift_;
+  const Timestamp start_time_;
+};
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_DRIFTING_CLOCK_H_