Merge "PackageManager Handler Thread Priorities adjustment." into tm-dev am: 4d14072e am: f33ea976 am: e93611b3 am: 835832b1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17988785



Change-Id: I5adbb85ab3ea5dc2575d56d04d0912d3e4b2a3e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>