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diff --git a/third_party/libwebrtc/api/video/nv12_buffer.h b/third_party/libwebrtc/api/video/nv12_buffer.h
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+++ b/third_party/libwebrtc/api/video/nv12_buffer.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 API_VIDEO_NV12_BUFFER_H_
+#define API_VIDEO_NV12_BUFFER_H_
+
+#include <memory>
+#include <utility>
+
+#include "api/scoped_refptr.h"
+#include "api/video/video_frame_buffer.h"
+#include "rtc_base/memory/aligned_malloc.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// NV12 is a biplanar encoding format, with full-resolution Y and
+// half-resolution interleved UV. More information can be found at
+// http://msdn.microsoft.com/library/windows/desktop/dd206750.aspx#nv12.
+class RTC_EXPORT NV12Buffer : public NV12BufferInterface {
+ public:
+  static rtc::scoped_refptr<NV12Buffer> Create(int width, int height);
+  static rtc::scoped_refptr<NV12Buffer> Create(int width,
+                                               int height,
+                                               int stride_y,
+                                               int stride_uv);
+  static rtc::scoped_refptr<NV12Buffer> Copy(
+      const I420BufferInterface& i420_buffer);
+
+  rtc::scoped_refptr<I420BufferInterface> ToI420() override;
+
+  int width() const override;
+  int height() const override;
+
+  int StrideY() const override;
+  int StrideUV() const override;
+
+  const uint8_t* DataY() const override;
+  const uint8_t* DataUV() const override;
+
+  uint8_t* MutableDataY();
+  uint8_t* MutableDataUV();
+
+  // Sets all three planes to all zeros. Used to work around for
+  // quirks in memory checkers
+  // (https://bugs.chromium.org/p/libyuv/issues/detail?id=377) and
+  // ffmpeg (http://crbug.com/390941).
+  // TODO(https://crbug.com/390941): Deprecated. Should be deleted if/when those
+  // issues are resolved in a better way. Or in the mean time, use SetBlack.
+  void InitializeData();
+
+  // Scale the cropped area of `src` to the size of `this` buffer, and
+  // write the result into `this`.
+  void CropAndScaleFrom(const NV12BufferInterface& src,
+                        int offset_x,
+                        int offset_y,
+                        int crop_width,
+                        int crop_height);
+
+ protected:
+  NV12Buffer(int width, int height);
+  NV12Buffer(int width, int height, int stride_y, int stride_uv);
+
+  ~NV12Buffer() override;
+
+ private:
+  size_t UVOffset() const;
+
+  const int width_;
+  const int height_;
+  const int stride_y_;
+  const int stride_uv_;
+  const std::unique_ptr<uint8_t, AlignedFreeDeleter> data_;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_NV12_BUFFER_H_