| droppedFrameCount | 输出自上次更新以来丢弃的帧数。 |
bool 如果丢弃的帧计数可用，则为 true，否则为 false。
检索 XR SDK 报告的丢弃的帧数。
丢弃的帧数可用于希望动态扩展内容或设置以便最大限度提高帧率的游戏或应用程序。XR 应用程序以一致的高帧率运行，这一点很重要。如果应用程序绘制太多资源或运行太多计算，则可能无法维持高帧率，而且会“丢弃”帧。当 SDK 报告正在丢弃帧时，游戏或应用程序可以调整设置、禁用对象或执行其他操作来减少开销。
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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