构建超时焦点多屏幕指示器。
可能在某一帧里游戏逻辑的处理时间会非常长，甚至会超时，这时我们可以稍稍暂停一下屏幕的渲染，使得游戏逻辑更新能够在这段时间里赶上来。
It is possible during a given frame that game logic will take too long. If a logic update cycle goes overtime, we can delay rendering for a bit to give ourselves a little extra time to catch up.
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