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diff --git a/third_party/libwebrtc/api/test/create_time_controller.h b/third_party/libwebrtc/api/test/create_time_controller.h
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+++ b/third_party/libwebrtc/api/test/create_time_controller.h
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+/*
+ *  Copyright 2019 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 API_TEST_CREATE_TIME_CONTROLLER_H_
+#define API_TEST_CREATE_TIME_CONTROLLER_H_
+
+#include <memory>
+
+#include "api/call/call_factory_interface.h"
+#include "api/test/time_controller.h"
+
+namespace webrtc {
+
+// Creates a time coltroller that wraps `alarm`.
+std::unique_ptr<TimeController> CreateTimeController(
+    ControlledAlarmClock* alarm);
+
+// Creates a time controller that runs in simulated time.
+std::unique_ptr<TimeController> CreateSimulatedTimeController();
+
+// This is creates a call factory that creates Call instances that are backed by
+// a time controller.
+std::unique_ptr<CallFactoryInterface> CreateTimeControllerBasedCallFactory(
+    TimeController* time_controller);
+
+}  // namespace webrtc
+
+#endif  // API_TEST_CREATE_TIME_CONTROLLER_H_