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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_TIME_CONTROLLER_H_
+#define API_TEST_TIME_CONTROLLER_H_
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "api/task_queue/task_queue_factory.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
+#include "rtc_base/synchronization/yield_policy.h"
+#include "rtc_base/thread.h"
+#include "system_wrappers/include/clock.h"
+
+namespace webrtc {
+// Interface for controlling time progress. This allows us to execute test code
+// in either real time or simulated time by using different implementation of
+// this interface.
+class TimeController {
+ public:
+  virtual ~TimeController() = default;
+  // Provides a clock instance that follows implementation defined time
+  // progress.
+  virtual Clock* GetClock() = 0;
+  // The returned factory will created task queues that runs in implementation
+  // defined time domain.
+  virtual TaskQueueFactory* GetTaskQueueFactory() = 0;
+  // Simple helper to create an owned factory that can be used as a parameter
+  // for PeerConnectionFactory. Note that this might depend on the underlying
+  // time controller and therfore must be destroyed before the time controller
+  // is destroyed.
+  std::unique_ptr<TaskQueueFactory> CreateTaskQueueFactory();
+
+  // Creates an rtc::Thread instance. If `socket_server` is nullptr, a default
+  // noop socket server is created.
+  // Returned thread is not null and started.
+  virtual std::unique_ptr<rtc::Thread> CreateThread(
+      const std::string& name,
+      std::unique_ptr<rtc::SocketServer> socket_server = nullptr) = 0;
+
+  // Creates an rtc::Thread instance that ensure that it's set as the current
+  // thread.
+  virtual rtc::Thread* GetMainThread() = 0;
+  // Allow task queues and process threads created by this instance to execute
+  // for the given `duration`.
+  virtual void AdvanceTime(TimeDelta duration) = 0;
+
+  // Waits until condition() == true, polling condition() in small time
+  // intervals.
+  // Returns true if condition() was evaluated to true before `max_duration`
+  // elapsed and false otherwise.
+  bool Wait(const std::function<bool()>& condition,
+            TimeDelta max_duration = TimeDelta::Seconds(5));
+};
+
+// Interface for telling time, scheduling an event to fire at a particular time,
+// and waiting for time to pass.
+class ControlledAlarmClock {
+ public:
+  virtual ~ControlledAlarmClock() = default;
+
+  // Gets a clock that tells the alarm clock's notion of time.
+  virtual Clock* GetClock() = 0;
+
+  // Schedules the alarm to fire at `deadline`.
+  // An alarm clock only supports one deadline. Calls to `ScheduleAlarmAt` with
+  // an earlier deadline will reset the alarm to fire earlier.Calls to
+  // `ScheduleAlarmAt` with a later deadline are ignored. Returns true if the
+  // deadline changed, false otherwise.
+  virtual bool ScheduleAlarmAt(Timestamp deadline) = 0;
+
+  // Sets the callback that should be run when the alarm fires.
+  virtual void SetCallback(std::function<void()> callback) = 0;
+
+  // Waits for `duration` to pass, according to the alarm clock.
+  virtual void Sleep(TimeDelta duration) = 0;
+};
+
+}  // namespace webrtc
+#endif  // API_TEST_TIME_CONTROLLER_H_