Merge "Fill in pprof time_nanos from profile timestamp" into main am: c38d95e395 am: 0d77f3906e am: 1c45893a9e

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

Change-Id: I19de7f7b1b8a39b03e1bf635596c7807d0e3ff13
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>