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

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

Change-Id: Ie020c3bc0f86e51c1dba50079715410e188513b8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>