| gpuTimeLastFrame | 输出 GPU 最后一帧花费的时间。 |
bool 如果 GPU 最后一帧花费的时间可用，则为 true，否则为 false。
检索 XR SDK 报告的 GPU 最后一帧花费的时间（以秒为单位）。
在支持此参数的 SDK 上，此方法允许从 SDK 本身访问更准确的用时信息。此信息可以计入在特定于 SDK 的层中花费的 GPU 时间。
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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