Merge "Fill in pprof time_nanos from profile timestamp" into main am: c38d95e395 am: cc8500f0e8

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2845196

Change-Id: I111e747eab906a3df9b38578c1db8297356d916b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>