| framePresentCount | 输出当前帧的显示次数。 |
bool 如果帧显示计数可用，则为 true，否则为 false。
检索 XR SDK 报告的当前帧绘制到设备中的次数。
如果性能下降，无论在某种程度上是否适应，一些 SDK 可能都会选择多次绘制当前帧以进行补偿。帧显示计数可以告知 SDK 是否多次向观察者呈现相同的帧。
统计信息并非始终可用，可能会因硬件、SDK 甚至随帧而异。因此，在使用 out 参数的统计信息值之前，请务必检查此方法的返回值。
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