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

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

Change-Id: I46efc4cd8d7f84044f93711fa50d55da67fd504d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>