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diff --git a/third_party/libwebrtc/modules/desktop_capture/window_finder.h b/third_party/libwebrtc/modules/desktop_capture/window_finder.h
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+++ b/third_party/libwebrtc/modules/desktop_capture/window_finder.h
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+/*
+ *  Copyright (c) 2017 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_WINDOW_FINDER_H_
+#define MODULES_DESKTOP_CAPTURE_WINDOW_FINDER_H_
+
+#include <memory>
+
+#include "api/scoped_refptr.h"
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+
+#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
+#include "modules/desktop_capture/mac/desktop_configuration_monitor.h"
+#endif
+
+namespace webrtc {
+
+#if defined(WEBRTC_USE_X11)
+class XAtomCache;
+#endif
+
+// An interface to return the id of the visible window under a certain point.
+class WindowFinder {
+ public:
+  WindowFinder() = default;
+  virtual ~WindowFinder() = default;
+
+  // Returns the id of the visible window under `point`. This function returns
+  // kNullWindowId if no window is under `point` and the platform does not have
+  // "root window" concept, i.e. the visible area under `point` is the desktop.
+  // `point` is always in system coordinate, i.e. the primary monitor always
+  // starts from (0, 0).
+  virtual WindowId GetWindowUnderPoint(DesktopVector point) = 0;
+
+  struct Options final {
+    Options();
+    ~Options();
+    Options(const Options& other);
+    Options(Options&& other);
+
+#if defined(WEBRTC_USE_X11)
+    XAtomCache* cache = nullptr;
+#endif
+#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
+    rtc::scoped_refptr<DesktopConfigurationMonitor> configuration_monitor;
+#endif
+  };
+
+  // Creates a platform-independent WindowFinder implementation. This function
+  // returns nullptr if `options` does not contain enough information or
+  // WindowFinder does not support current platform.
+  static std::unique_ptr<WindowFinder> Create(const Options& options);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_WINDOW_FINDER_H_