什么是com.google.android.gms.persistent，为什么总是使用CPU？

Even when nothing else is happening this system process seems to use a steady 1-2% of the CPU. Over the course of a day this drains a significant amount of battery even when the device wasn't used for anything. I haven't been able to correlate it to any other apps because even when they have only used a few seconds of CPU time each over the course of several hours this process is using minutes.Even when nothing else is happening this system