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diff --git a/third_party/libwebrtc/video/receive_statistics_proxy.h b/third_party/libwebrtc/video/receive_statistics_proxy.h
new file mode 100644
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+++ b/third_party/libwebrtc/video/receive_statistics_proxy.h
@@ -0,0 +1,216 @@
+/*
+ *  Copyright (c) 2020 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 VIDEO_RECEIVE_STATISTICS_PROXY_H_
+#define VIDEO_RECEIVE_STATISTICS_PROXY_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/sequence_checker.h"
+#include "api/task_queue/pending_task_safety_flag.h"
+#include "api/task_queue/task_queue_base.h"
+#include "api/units/timestamp.h"
+#include "api/video_codecs/video_decoder.h"
+#include "call/video_receive_stream.h"
+#include "modules/include/module_common_types.h"
+#include "rtc_base/numerics/histogram_percentile_counter.h"
+#include "rtc_base/numerics/moving_max_counter.h"
+#include "rtc_base/numerics/sample_counter.h"
+#include "rtc_base/rate_statistics.h"
+#include "rtc_base/rate_tracker.h"
+#include "rtc_base/system/no_unique_address.h"
+#include "rtc_base/thread_annotations.h"
+#include "video/stats_counter.h"
+#include "video/video_quality_observer2.h"
+#include "video/video_stream_buffer_controller.h"
+
+namespace webrtc {
+
+class Clock;
+struct CodecSpecificInfo;
+
+namespace internal {
+// Declared in video_receive_stream2.h.
+struct VideoFrameMetaData;
+
+class ReceiveStatisticsProxy : public VideoStreamBufferControllerStatsObserver,
+                               public RtcpCnameCallback,
+                               public RtcpPacketTypeCounterObserver {
+ public:
+  ReceiveStatisticsProxy(uint32_t remote_ssrc,
+                         Clock* clock,
+                         TaskQueueBase* worker_thread);
+  ~ReceiveStatisticsProxy() override;
+
+  VideoReceiveStreamInterface::Stats GetStats() const;
+
+  void OnDecodedFrame(const VideoFrame& frame,
+                      absl::optional<uint8_t> qp,
+                      TimeDelta decode_time,
+                      VideoContentType content_type,
+                      VideoFrameType frame_type);
+
+  // Called asyncronously on the worker thread as a result of a call to the
+  // above OnDecodedFrame method, which is called back on the thread where
+  // the actual decoding happens.
+  void OnDecodedFrame(const VideoFrameMetaData& frame_meta,
+                      absl::optional<uint8_t> qp,
+                      TimeDelta decode_time,
+                      TimeDelta processing_delay,
+                      TimeDelta assembly_time,
+                      VideoContentType content_type,
+                      VideoFrameType frame_type);
+
+  void OnSyncOffsetUpdated(int64_t video_playout_ntp_ms,
+                           int64_t sync_offset_ms,
+                           double estimated_freq_khz);
+  void OnRenderedFrame(const VideoFrameMetaData& frame_meta);
+  void OnIncomingPayloadType(int payload_type);
+  void OnDecoderInfo(const VideoDecoder::DecoderInfo& decoder_info);
+
+  void OnPreDecode(VideoCodecType codec_type, int qp);
+
+  void OnUniqueFramesCounted(int num_unique_frames);
+
+  // Indicates video stream has been paused (no incoming packets).
+  void OnStreamInactive();
+
+  // Implements VideoStreamBufferControllerStatsObserver.
+  void OnCompleteFrame(bool is_keyframe,
+                       size_t size_bytes,
+                       VideoContentType content_type) override;
+  void OnDroppedFrames(uint32_t frames_dropped) override;
+  void OnDecodableFrame(TimeDelta jitter_buffer_delay,
+                        TimeDelta target_delay,
+                        TimeDelta minimum_delay) override;
+  void OnDiscardedPackets(uint32_t packets_discarded) override;
+  void OnFrameBufferTimingsUpdated(int estimated_max_decode_time_ms,
+                                   int current_delay_ms,
+                                   int target_delay_ms,
+                                   int jitter_delay_ms,
+                                   int min_playout_delay_ms,
+                                   int render_delay_ms) override;
+  void OnTimingFrameInfoUpdated(const TimingFrameInfo& info) override;
+
+  // Implements RtcpCnameCallback.
+  void OnCname(uint32_t ssrc, absl::string_view cname) override;
+
+  // Implements RtcpPacketTypeCounterObserver.
+  void RtcpPacketTypesCounterUpdated(
+      uint32_t ssrc,
+      const RtcpPacketTypeCounter& packet_counter) override;
+
+  void OnRttUpdate(int64_t avg_rtt_ms);
+
+  // Notification methods that are used to check our internal state and validate
+  // threading assumptions. These are called by VideoReceiveStreamInterface.
+  void DecoderThreadStarting();
+  void DecoderThreadStopped();
+
+  // Produce histograms. Must be called after DecoderThreadStopped(), typically
+  // at the end of the call.
+  void UpdateHistograms(absl::optional<int> fraction_lost,
+                        const StreamDataCounters& rtp_stats,
+                        const StreamDataCounters* rtx_stats);
+
+ private:
+  struct QpCounters {
+    rtc::SampleCounter vp8;
+  };
+
+  struct ContentSpecificStats {
+    ContentSpecificStats();
+    ~ContentSpecificStats();
+
+    void Add(const ContentSpecificStats& other);
+
+    rtc::SampleCounter e2e_delay_counter;
+    rtc::SampleCounter interframe_delay_counter;
+    int64_t flow_duration_ms = 0;
+    int64_t total_media_bytes = 0;
+    rtc::SampleCounter received_width;
+    rtc::SampleCounter received_height;
+    rtc::SampleCounter qp_counter;
+    FrameCounts frame_counts;
+    rtc::HistogramPercentileCounter interframe_delay_percentiles;
+  };
+
+  // Removes info about old frames and then updates the framerate.
+  void UpdateFramerate(int64_t now_ms) const;
+
+  absl::optional<int64_t> GetCurrentEstimatedPlayoutNtpTimestampMs(
+      int64_t now_ms) const;
+
+  Clock* const clock_;
+  const int64_t start_ms_;
+
+  // Note: The `stats_.rtp_stats` member is not used or populated by this class.
+  mutable VideoReceiveStreamInterface::Stats stats_
+      RTC_GUARDED_BY(main_thread_);
+  // Same as stats_.ssrc, but const (no lock required).
+  const uint32_t remote_ssrc_;
+  RateStatistics decode_fps_estimator_ RTC_GUARDED_BY(main_thread_);
+  RateStatistics renders_fps_estimator_ RTC_GUARDED_BY(main_thread_);
+  rtc::RateTracker render_fps_tracker_ RTC_GUARDED_BY(main_thread_);
+  rtc::RateTracker render_pixel_tracker_ RTC_GUARDED_BY(main_thread_);
+  rtc::SampleCounter sync_offset_counter_ RTC_GUARDED_BY(main_thread_);
+  rtc::SampleCounter decode_time_counter_ RTC_GUARDED_BY(main_thread_);
+  rtc::SampleCounter jitter_delay_counter_ RTC_GUARDED_BY(main_thread_);
+  rtc::SampleCounter target_delay_counter_ RTC_GUARDED_BY(main_thread_);
+  rtc::SampleCounter current_delay_counter_ RTC_GUARDED_BY(main_thread_);
+  rtc::SampleCounter oneway_delay_counter_ RTC_GUARDED_BY(main_thread_);
+  std::unique_ptr<VideoQualityObserver> video_quality_observer_
+      RTC_GUARDED_BY(main_thread_);
+  mutable rtc::MovingMaxCounter<int> interframe_delay_max_moving_
+      RTC_GUARDED_BY(main_thread_);
+  std::map<VideoContentType, ContentSpecificStats> content_specific_stats_
+      RTC_GUARDED_BY(main_thread_);
+  MaxCounter freq_offset_counter_ RTC_GUARDED_BY(main_thread_);
+  QpCounters qp_counters_ RTC_GUARDED_BY(main_thread_);
+  int64_t avg_rtt_ms_ RTC_GUARDED_BY(main_thread_) = 0;
+  mutable std::map<int64_t, size_t> frame_window_ RTC_GUARDED_BY(main_thread_);
+  VideoContentType last_content_type_ RTC_GUARDED_BY(&main_thread_);
+  VideoCodecType last_codec_type_ RTC_GUARDED_BY(main_thread_);
+  absl::optional<int64_t> first_frame_received_time_ms_
+      RTC_GUARDED_BY(main_thread_);
+  absl::optional<int64_t> first_decoded_frame_time_ms_
+      RTC_GUARDED_BY(main_thread_);
+  absl::optional<int64_t> last_decoded_frame_time_ms_
+      RTC_GUARDED_BY(main_thread_);
+  size_t num_delayed_frames_rendered_ RTC_GUARDED_BY(main_thread_);
+  int64_t sum_missed_render_deadline_ms_ RTC_GUARDED_BY(main_thread_);
+  // Mutable because calling Max() on MovingMaxCounter is not const. Yet it is
+  // called from const GetStats().
+  mutable rtc::MovingMaxCounter<TimingFrameInfo> timing_frame_info_counter_
+      RTC_GUARDED_BY(main_thread_);
+  absl::optional<int> num_unique_frames_ RTC_GUARDED_BY(main_thread_);
+  absl::optional<int64_t> last_estimated_playout_ntp_timestamp_ms_
+      RTC_GUARDED_BY(main_thread_);
+  absl::optional<int64_t> last_estimated_playout_time_ms_
+      RTC_GUARDED_BY(main_thread_);
+
+  // The thread on which this instance is constructed and some of its main
+  // methods are invoked on such as GetStats().
+  TaskQueueBase* const worker_thread_;
+
+  ScopedTaskSafety task_safety_;
+
+  RTC_NO_UNIQUE_ADDRESS SequenceChecker decode_queue_;
+  SequenceChecker main_thread_;
+  RTC_NO_UNIQUE_ADDRESS SequenceChecker incoming_render_queue_;
+};
+
+}  // namespace internal
+}  // namespace webrtc
+#endif  // VIDEO_RECEIVE_STATISTICS_PROXY_H_