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diff --git a/third_party/libwebrtc/modules/desktop_capture/delegated_source_list_controller.h b/third_party/libwebrtc/modules/desktop_capture/delegated_source_list_controller.h
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+/*
+ *  Copyright (c) 2022 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_DELEGATED_SOURCE_LIST_CONTROLLER_H_
+#define MODULES_DESKTOP_CAPTURE_DELEGATED_SOURCE_LIST_CONTROLLER_H_
+
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// A controller to be implemented and returned by
+// GetDelegatedSourceListController in capturers that require showing their own
+// source list and managing user selection there. Apart from ensuring the
+// visibility of the source list, these capturers should largely be interacted
+// with the same as a normal capturer, though there may be some caveats for
+// some DesktopCapturer methods. See GetDelegatedSourceListController for more
+// information.
+class RTC_EXPORT DelegatedSourceListController {
+ public:
+  // Notifications that can be used to help drive any UI that the consumer may
+  // want to show around this source list (e.g. if an consumer shows their own
+  // UI in addition to the delegated source list).
+  class Observer {
+   public:
+    // Called after the user has made a selection in the delegated source list.
+    // Note that the consumer will still need to get the source out of the
+    // capturer by calling GetSourceList.
+    virtual void OnSelection() = 0;
+
+    // Called when there is any user action that cancels the source selection.
+    virtual void OnCancelled() = 0;
+
+    // Called when there is a system error that cancels the source selection.
+    virtual void OnError() = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  // Observer must remain valid until the owning DesktopCapturer is destroyed.
+  // Only one Observer is allowed at a time, and may be cleared by passing
+  // nullptr.
+  virtual void Observe(Observer* observer) = 0;
+
+  // Used to prompt the capturer to show the delegated source list. If the
+  // source list is already visible, this will be a no-op. Must be called after
+  // starting the DesktopCapturer.
+  //
+  // Note that any selection from a previous invocation of the source list may
+  // be cleared when this method is called.
+  virtual void EnsureVisible() = 0;
+
+  // Used to prompt the capturer to hide the delegated source list. If the
+  // source list is already hidden, this will be a no-op.
+  virtual void EnsureHidden() = 0;
+
+ protected:
+  virtual ~DelegatedSourceListController() {}
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_DELEGATED_SOURCE_LIST_CONTROLLER_H_