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diff --git a/third_party/libwebrtc/test/run_loop.h b/third_party/libwebrtc/test/run_loop.h
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+++ b/third_party/libwebrtc/test/run_loop.h
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+/*
+ *  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 TEST_RUN_LOOP_H_
+#define TEST_RUN_LOOP_H_
+
+#include <utility>
+
+#include "absl/functional/any_invocable.h"
+#include "api/task_queue/task_queue_base.h"
+#include "rtc_base/thread.h"
+
+namespace webrtc {
+namespace test {
+
+// This utility class allows you to run a TaskQueue supported interface on the
+// main test thread, call Run() while doing things asynchonously and break
+// the loop (from the same thread) from a callback by calling Quit().
+class RunLoop {
+ public:
+  RunLoop();
+  ~RunLoop();
+
+  TaskQueueBase* task_queue();
+
+  void Run();
+  void Quit();
+
+  void Flush();
+
+  void PostTask(absl::AnyInvocable<void() &&> task) {
+    task_queue()->PostTask(std::move(task));
+  }
+
+ private:
+  class FakeSocketServer : public rtc::SocketServer {
+   public:
+    FakeSocketServer();
+    ~FakeSocketServer();
+
+    void FailNextWait();
+
+   private:
+    bool Wait(webrtc::TimeDelta max_wait_duration, bool process_io) override;
+    void WakeUp() override;
+
+    rtc::Socket* CreateSocket(int family, int type) override;
+
+   private:
+    bool fail_next_wait_ = false;
+  };
+
+  class WorkerThread : public rtc::Thread {
+   public:
+    explicit WorkerThread(rtc::SocketServer* ss);
+
+   private:
+    CurrentTaskQueueSetter tq_setter_;
+  };
+
+  FakeSocketServer socket_server_;
+  WorkerThread worker_thread_{&socket_server_};
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_RUN_LOOP_H_