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diff --git a/third_party/libwebrtc/video/video_quality_observer2.h b/third_party/libwebrtc/video/video_quality_observer2.h
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+/*
+ *  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_VIDEO_QUALITY_OBSERVER2_H_
+#define VIDEO_VIDEO_QUALITY_OBSERVER2_H_
+
+#include <stdint.h>
+
+#include <set>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/video/video_codec_type.h"
+#include "api/video/video_content_type.h"
+#include "rtc_base/numerics/moving_average.h"
+#include "rtc_base/numerics/sample_counter.h"
+
+namespace webrtc {
+namespace internal {
+// Declared in video_receive_stream2.h.
+struct VideoFrameMetaData;
+
+// Calculates spatial and temporal quality metrics and reports them to UMA
+// stats.
+class VideoQualityObserver {
+ public:
+  // Use either VideoQualityObserver::kBlockyQpThresholdVp8 or
+  // VideoQualityObserver::kBlockyQpThresholdVp9.
+  VideoQualityObserver();
+  ~VideoQualityObserver() = default;
+
+  void OnDecodedFrame(uint32_t rtp_frame_timestamp,
+                      absl::optional<uint8_t> qp,
+                      VideoCodecType codec);
+
+  void OnRenderedFrame(const VideoFrameMetaData& frame_meta);
+
+  void OnStreamInactive();
+
+  uint32_t NumFreezes() const;
+  uint32_t NumPauses() const;
+  uint32_t TotalFreezesDurationMs() const;
+  uint32_t TotalPausesDurationMs() const;
+  uint32_t TotalFramesDurationMs() const;
+  double SumSquaredFrameDurationsSec() const;
+
+  // Set `screenshare` to true if the last decoded frame was for screenshare.
+  void UpdateHistograms(bool screenshare);
+
+  static const uint32_t kMinFrameSamplesToDetectFreeze;
+  static const uint32_t kMinIncreaseForFreezeMs;
+  static const uint32_t kAvgInterframeDelaysWindowSizeFrames;
+
+ private:
+  enum Resolution {
+    Low = 0,
+    Medium = 1,
+    High = 2,
+  };
+
+  int64_t last_frame_rendered_ms_;
+  int64_t num_frames_rendered_;
+  int64_t first_frame_rendered_ms_;
+  int64_t last_frame_pixels_;
+  bool is_last_frame_blocky_;
+  // Decoded timestamp of the last delayed frame.
+  int64_t last_unfreeze_time_ms_;
+  rtc::MovingAverage render_interframe_delays_;
+  double sum_squared_interframe_delays_secs_;
+  // An inter-frame delay is counted as a freeze if it's significantly longer
+  // than average inter-frame delay.
+  rtc::SampleCounter freezes_durations_;
+  rtc::SampleCounter pauses_durations_;
+  // Time between freezes.
+  rtc::SampleCounter smooth_playback_durations_;
+  // Counters for time spent in different resolutions. Time between each two
+  // Consecutive frames is counted to bin corresponding to the first frame
+  // resolution.
+  std::vector<int64_t> time_in_resolution_ms_;
+  // Resolution of the last decoded frame. Resolution enum is used as an index.
+  Resolution current_resolution_;
+  int num_resolution_downgrades_;
+  // Similar to resolution, time spent in high-QP video.
+  int64_t time_in_blocky_video_ms_;
+  bool is_paused_;
+
+  // Set of decoded frames with high QP value.
+  std::set<int64_t> blocky_frames_;
+};
+
+}  // namespace internal
+}  // namespace webrtc
+
+#endif  // VIDEO_VIDEO_QUALITY_OBSERVER2_H_