Merge "ActivityManagerService: report current and max thrashing levels" into sc-dev am: 246926de am: 9a1550ca am: af89623d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15365174

Change-Id: Ibbb02c5f495fd73cf18a5de36fa48bf089dfdb16