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diff --git a/third_party/libwebrtc/modules/desktop_capture/win/screen_capture_utils.h b/third_party/libwebrtc/modules/desktop_capture/win/screen_capture_utils.h
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+++ b/third_party/libwebrtc/modules/desktop_capture/win/screen_capture_utils.h
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+/*
+ *  Copyright (c) 2014 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_WIN_SCREEN_CAPTURE_UTILS_H_
+#define MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURE_UTILS_H_
+
+#if defined(WEBRTC_WIN)
+// Forward declare HMONITOR in a windows.h compatible way so that we can avoid
+// including windows.h.
+#define WEBRTC_DECLARE_HANDLE(name) \
+  struct name##__;                  \
+  typedef struct name##__* name
+WEBRTC_DECLARE_HANDLE(HMONITOR);
+#undef WEBRTC_DECLARE_HANDLE
+#endif
+
+#include <string>
+#include <vector>
+
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// Returns true if the system has at least one active display.
+bool HasActiveDisplay();
+
+// Output the list of active screens into `screens`. Returns true if succeeded,
+// or false if it fails to enumerate the display devices. If the `device_names`
+// is provided, it will be filled with the DISPLAY_DEVICE.DeviceName in UTF-8
+// encoding. If this function returns true, consumers can always assume that
+// `screens`[i] and `device_names`[i] indicate the same monitor on the system.
+bool GetScreenList(DesktopCapturer::SourceList* screens,
+                   std::vector<std::string>* device_names = nullptr);
+
+// Converts a device index (which are returned by `GetScreenList`) into an
+// HMONITOR.
+bool GetHmonitorFromDeviceIndex(DesktopCapturer::SourceId device_index,
+                                HMONITOR* hmonitor);
+
+// Returns true if `monitor` represents a valid display
+// monitor. Consumers should recheck the validity of HMONITORs before use if a
+// WM_DISPLAYCHANGE message has been received.
+bool IsMonitorValid(HMONITOR monitor);
+
+// Returns the rect of the monitor identified by `monitor`, relative to the
+// primary display's top-left. On failure, returns an empty rect.
+DesktopRect GetMonitorRect(HMONITOR monitor);
+
+// Returns the DPI for the specified monitor. On failure, returns the system DPI
+// or the Windows default DPI (96x96) if the system DPI can't be retrieved.
+DesktopVector GetDpiForMonitor(HMONITOR monitor);
+
+// Returns true if `screen` is a valid screen. The screen device key is
+// returned through `device_key` if the screen is valid. The device key can be
+// used in GetScreenRect to verify the screen matches the previously obtained
+// id.
+bool IsScreenValid(DesktopCapturer::SourceId screen, std::wstring* device_key);
+
+// Get the rect of the entire system in system coordinate system. I.e. the
+// primary monitor always starts from (0, 0).
+DesktopRect GetFullscreenRect();
+
+// Get the rect of the screen identified by `screen`, relative to the primary
+// display's top-left. If the screen device key does not match `device_key`, or
+// the screen does not exist, or any error happens, an empty rect is returned.
+RTC_EXPORT DesktopRect GetScreenRect(DesktopCapturer::SourceId screen,
+                                     const std::wstring& device_key);
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURE_UTILS_H_