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diff --git a/third_party/libwebrtc/common_video/framerate_controller.h b/third_party/libwebrtc/common_video/framerate_controller.h
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+/*
+ *  Copyright 2021 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 COMMON_VIDEO_FRAMERATE_CONTROLLER_H_
+#define COMMON_VIDEO_FRAMERATE_CONTROLLER_H_
+
+#include <stdint.h>
+
+#include "absl/types/optional.h"
+
+namespace webrtc {
+
+// Determines which frames that should be dropped based on input framerate and
+// requested framerate.
+class FramerateController {
+ public:
+  FramerateController();
+  explicit FramerateController(double max_framerate);
+  ~FramerateController();
+
+  // Sets max framerate (default is maxdouble).
+  void SetMaxFramerate(double max_framerate);
+  double GetMaxFramerate() const;
+
+  // Returns true if the frame should be dropped, false otherwise.
+  bool ShouldDropFrame(int64_t in_timestamp_ns);
+
+  void Reset();
+
+  void KeepFrame(int64_t in_timestamp_ns);
+
+ private:
+  double max_framerate_;
+  absl::optional<int64_t> next_frame_timestamp_ns_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_VIDEO_FRAMERATE_CONTROLLER_H_