此函数触发 FrameTimingManager，以便捕获 FrameTiming 数据的快照，然后用户可访问这些数据。
FrameTimingManager 尝试捕获该平台允许的帧数，但将仅从完成的帧和有效帧捕获完整计时，因此它捕获的帧数可能会有所不同。如果该平台在深度数据方面提供更多支持，这还将捕获平台特定的扩展帧计时数据。
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