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diff --git a/third_party/libwebrtc/modules/desktop_capture/desktop_frame_rotation.h b/third_party/libwebrtc/modules/desktop_capture/desktop_frame_rotation.h
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+++ b/third_party/libwebrtc/modules/desktop_capture/desktop_frame_rotation.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 MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_ROTATION_H_
+#define MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_ROTATION_H_
+
+#include "modules/desktop_capture/desktop_frame.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+
+namespace webrtc {
+
+// Represents the rotation of a DesktopFrame.
+enum class Rotation {
+  CLOCK_WISE_0,
+  CLOCK_WISE_90,
+  CLOCK_WISE_180,
+  CLOCK_WISE_270,
+};
+
+// Rotates input DesktopFrame `source`, copies pixel in an unrotated rectangle
+// `source_rect` into the target rectangle of another DesktopFrame `target`.
+// Target rectangle here is the rotated `source_rect` plus `target_offset`.
+// `rotation` specifies `source` to `target` rotation. `source_rect` is in
+// `source` coordinate. `target_offset` is in `target` coordinate.
+// This function triggers check failure if `source` does not cover the
+// `source_rect`, or `target` does not cover the rotated `rect`.
+void RotateDesktopFrame(const DesktopFrame& source,
+                        const DesktopRect& source_rect,
+                        const Rotation& rotation,
+                        const DesktopVector& target_offset,
+                        DesktopFrame* target);
+
+// Returns a reverse rotation of `rotation`.
+Rotation ReverseRotation(Rotation rotation);
+
+// Returns a rotated DesktopSize of `size`.
+DesktopSize RotateSize(DesktopSize size, Rotation rotation);
+
+// Returns a rotated DesktopRect of `rect`. The `size` represents the size of
+// the DesktopFrame which `rect` belongs in.
+DesktopRect RotateRect(DesktopRect rect, DesktopSize size, Rotation rotation);
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_ROTATION_H_