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diff --git a/third_party/libwebrtc/modules/desktop_capture/desktop_capturer.h b/third_party/libwebrtc/modules/desktop_capture/desktop_capturer.h
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+++ b/third_party/libwebrtc/modules/desktop_capture/desktop_capturer.h
@@ -0,0 +1,188 @@
+/*
+ *  Copyright (c) 2013 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_CAPTURER_H_
+#define MODULES_DESKTOP_CAPTURE_DESKTOP_CAPTURER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#if defined(WEBRTC_USE_GIO)
+#include "modules/desktop_capture/desktop_capture_metadata.h"
+#endif  // defined(WEBRTC_USE_GIO)
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_frame.h"
+#include "modules/desktop_capture/shared_memory.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+class DesktopCaptureOptions;
+class DesktopFrame;
+
+// Abstract interface for screen and window capturers.
+class RTC_EXPORT DesktopCapturer {
+ public:
+  enum class Result {
+    // The frame was captured successfully.
+    SUCCESS,
+
+    // There was a temporary error. The caller should continue calling
+    // CaptureFrame(), in the expectation that it will eventually recover.
+    ERROR_TEMPORARY,
+
+    // Capture has failed and will keep failing if the caller tries calling
+    // CaptureFrame() again.
+    ERROR_PERMANENT,
+
+    MAX_VALUE = ERROR_PERMANENT
+  };
+
+  // Interface that must be implemented by the DesktopCapturer consumers.
+  class Callback {
+   public:
+    // Called after a frame has been captured. `frame` is not nullptr if and
+    // only if `result` is SUCCESS.
+    virtual void OnCaptureResult(Result result,
+                                 std::unique_ptr<DesktopFrame> frame) = 0;
+
+   protected:
+    virtual ~Callback() {}
+  };
+
+#if defined(CHROMEOS)
+  typedef int64_t SourceId;
+#else
+  typedef intptr_t SourceId;
+#endif
+
+  static_assert(std::is_same<SourceId, ScreenId>::value,
+                "SourceId should be a same type as ScreenId.");
+
+  struct Source {
+    // The unique id to represent a Source of current DesktopCapturer.
+    SourceId id;
+    pid_t pid;
+
+    // Title of the window or screen in UTF-8 encoding, maybe empty. This field
+    // should not be used to identify a source.
+    std::string title;
+  };
+
+  typedef std::vector<Source> SourceList;
+
+  virtual ~DesktopCapturer();
+
+  // Called at the beginning of a capturing session. `callback` must remain
+  // valid until capturer is destroyed.
+  virtual void Start(Callback* callback) = 0;
+
+  // Sets SharedMemoryFactory that will be used to create buffers for the
+  // captured frames. The factory can be invoked on a thread other than the one
+  // where CaptureFrame() is called. It will be destroyed on the same thread.
+  // Shared memory is currently supported only by some DesktopCapturer
+  // implementations.
+  virtual void SetSharedMemoryFactory(
+      std::unique_ptr<SharedMemoryFactory> shared_memory_factory);
+
+  // Captures next frame, and involve callback provided by Start() function.
+  // Pending capture requests are canceled when DesktopCapturer is deleted.
+  virtual void CaptureFrame() = 0;
+
+  // Sets the window to be excluded from the captured image in the future
+  // Capture calls. Used to exclude the screenshare notification window for
+  // screen capturing.
+  virtual void SetExcludedWindow(WindowId window);
+
+  // TODO(zijiehe): Following functions should be pure virtual. The default
+  // implementations are for backward compatibility only. Remove default
+  // implementations once all DesktopCapturer implementations in Chromium have
+  // implemented these functions.
+
+  // Gets a list of sources current capturer supports. Returns false in case of
+  // a failure.
+  // For DesktopCapturer implementations to capture screens, this function
+  // should return monitors.
+  // For DesktopCapturer implementations to capture windows, this function
+  // should only return root windows owned by applications.
+  virtual bool GetSourceList(SourceList* sources);
+
+  // Selects a source to be captured. Returns false in case of a failure (e.g.
+  // if there is no source with the specified type and id.)
+  virtual bool SelectSource(SourceId id);
+
+  // Brings the selected source to the front and sets the input focus on it.
+  // Returns false in case of a failure or no source has been selected or the
+  // implementation does not support this functionality.
+  virtual bool FocusOnSelectedSource();
+
+  // Returns true if the `pos` on the selected source is covered by other
+  // elements on the display, and is not visible to the users.
+  // `pos` is in full desktop coordinates, i.e. the top-left monitor always
+  // starts from (0, 0).
+  // The return value if `pos` is out of the scope of the source is undefined.
+  virtual bool IsOccluded(const DesktopVector& pos);
+
+  // Creates a DesktopCapturer instance which targets to capture windows.
+  static std::unique_ptr<DesktopCapturer> CreateWindowCapturer(
+      const DesktopCaptureOptions& options);
+
+  // Creates a DesktopCapturer instance which targets to capture screens.
+  static std::unique_ptr<DesktopCapturer> CreateScreenCapturer(
+      const DesktopCaptureOptions& options);
+
+  // Creates a DesktopCapturer instance which targets to capture tab.
+  static std::unique_ptr<DesktopCapturer> CreateTabCapturer(
+      const DesktopCaptureOptions& options);
+
+#if defined(WEBRTC_USE_PIPEWIRE) || defined(WEBRTC_USE_X11)
+  static bool IsRunningUnderWayland();
+
+  virtual void UpdateResolution(uint32_t width, uint32_t height) {}
+#endif  // defined(WEBRTC_USE_PIPEWIRE) || defined(WEBRTC_USE_X11)
+
+#if defined(WEBRTC_USE_GIO)
+  // Populates implementation specific metadata into the passed in pointer.
+  // Classes can choose to override it or use the default no-op implementation.
+  virtual DesktopCaptureMetadata GetMetadata() { return {}; }
+#endif  // defined(WEBRTC_USE_GIO)
+
+ protected:
+  // CroppingWindowCapturer needs to create raw capturers without wrappers, so
+  // the following two functions are protected.
+
+  // Creates a platform specific DesktopCapturer instance which targets to
+  // capture windows.
+  static std::unique_ptr<DesktopCapturer> CreateRawWindowCapturer(
+      const DesktopCaptureOptions& options);
+
+  // Creates a platform specific DesktopCapturer instance which targets to
+  // capture screens.
+  static std::unique_ptr<DesktopCapturer> CreateRawScreenCapturer(
+      const DesktopCaptureOptions& options);
+
+  // Creates a platform specific DesktopCapturer instance which targets to
+  // capture apps.
+  static std::unique_ptr<DesktopCapturer> CreateRawAppCapturer(
+      const DesktopCaptureOptions& options);
+
+  // Creates a DesktopCapturer instance which targets to capture tabs
+  static std::unique_ptr<DesktopCapturer> CreateRawTabCapturer(
+      const DesktopCaptureOptions& options);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_DESKTOP_CAPTURER_H_