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diff --git a/third_party/libwebrtc/modules/desktop_capture/screen_drawer.h b/third_party/libwebrtc/modules/desktop_capture/screen_drawer.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_SCREEN_DRAWER_H_
+#define MODULES_DESKTOP_CAPTURE_SCREEN_DRAWER_H_
+
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+#include "modules/desktop_capture/rgba_color.h"
+
+namespace webrtc {
+
+// A cross-process lock to ensure only one ScreenDrawer can be used at a certain
+// time.
+class ScreenDrawerLock {
+ public:
+  virtual ~ScreenDrawerLock();
+
+  static std::unique_ptr<ScreenDrawerLock> Create();
+
+ protected:
+  ScreenDrawerLock();
+};
+
+// A set of basic platform dependent functions to draw various shapes on the
+// screen.
+class ScreenDrawer {
+ public:
+  // Creates a ScreenDrawer for the current platform, returns nullptr if no
+  // ScreenDrawer implementation available.
+  // If the implementation cannot guarantee two ScreenDrawer instances won't
+  // impact each other, this function may block current thread until another
+  // ScreenDrawer has been destroyed.
+  static std::unique_ptr<ScreenDrawer> Create();
+
+  ScreenDrawer();
+  virtual ~ScreenDrawer();
+
+  // Returns the region inside which DrawRectangle() function are expected to
+  // work, in capturer coordinates (assuming ScreenCapturer::SelectScreen has
+  // not been called). This region may exclude regions of the screen reserved by
+  // the OS for things like menu bars or app launchers. The DesktopRect is in
+  // system coordinate, i.e. the primary monitor always starts from (0, 0).
+  virtual DesktopRect DrawableRegion() = 0;
+
+  // Draws a rectangle to cover `rect` with `color`. Note, rect.bottom() and
+  // rect.right() two lines are not included. The part of `rect` which is out of
+  // DrawableRegion() will be ignored.
+  virtual void DrawRectangle(DesktopRect rect, RgbaColor color) = 0;
+
+  // Clears all content on the screen by filling the area with black.
+  virtual void Clear() = 0;
+
+  // Blocks current thread until OS finishes previous DrawRectangle() actions.
+  // ScreenCapturer should be able to capture the changes after this function
+  // finish.
+  virtual void WaitForPendingDraws() = 0;
+
+  // Returns true if incomplete shapes previous actions required may be drawn on
+  // the screen after a WaitForPendingDraws() call. i.e. Though the complete
+  // shapes will eventually be drawn on the screen, due to some OS limitations,
+  // these shapes may be partially appeared sometimes.
+  virtual bool MayDrawIncompleteShapes() = 0;
+
+  // Returns the id of the drawer window. This function returns kNullWindowId if
+  // the implementation does not draw on a window of the system.
+  virtual WindowId window_id() const = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_SCREEN_DRAWER_H_