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

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



Change-Id: Ifd1ebeb1574240011bb701714ad358743e93a9bf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>