Merge "Persistent process is ProcessRecord.isPersistent()." into tm-dev am: 4a1fc38e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17993187



Change-Id: I976af42c54192126699aa99d5dd42e222702e310
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>