Validate package names passed to the installer. am: d42af9a5 am: dd8a33e1 am: f7b47c51

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25648374



Change-Id: I336b74b31a034f516231ba9b025ade92d4e7f054
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>