UnityEditor.TimeHelper.Begin C# (CSharp) Method

        public void Begin()
        {
            this.lastTime = DateTime.Now.Ticks;
        }

        private static void HandleKeyDown(SceneView sceneView)
        {
            if (Event.current.keyCode == KeyCode.Escape && GUIUtility.hotControl == s_ViewToolID)
            {
                GUIUtility.hotControl = 0;
                ResetDragState();
            }

            if (Tools.s_LockedViewTool == ViewTool.FPS)
            {
                Event   evt        = Event.current;
                Vector3 lastMotion = s_Motion;
                if (evt.keyCode == ((Event)kFPSForward).keyCode)
                {
                    sceneView.viewIsLockedToObject = false;
                    s_Motion.z = 1;
                    evt.Use();
                }
                else if (evt.keyCode == ((Event)kFPSBack).keyCode)
                {
                    sceneView.viewIsLockedToObject = false;
                    s_Motion.z = -1;
                    evt.Use();
                }
                else if (evt.keyCode == ((Event)kFPSLeft).keyCode)
                {
                    sceneView.viewIsLockedToObject = false;
                    s_Motion.x = -1;
                    evt.Use();
                }
                else if (evt.keyCode == ((Event)kFPSRight).keyCode)
                {
                    sceneView.viewIsLockedToObject = false;
                    s_Motion.x = 1;
                    evt.Use();
                }
                else if (evt.keyCode == ((Event)kFPSUp).keyCode)
                {
                    sceneView.viewIsLockedToObject = false;
                    s_Motion.y = 1;
                    evt.Use();
                }
                else if (evt.keyCode == ((Event)kFPSDown).keyCode)
                {
                    sceneView.viewIsLockedToObject = false;
                    s_Motion.y = -1;
                    evt.Use();
                }

                if (evt.type != EventType.KeyDown && lastMotion.sqrMagnitude == 0)
                {
                    s_FPSTiming.Begin();
                }
            }
        }