[RESTRICT AUTOMERGE] Check whether installerPackageName contains only valid characters am: 6dab15262b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/28318629

Change-Id: Ia11093cbd60c6ce04be0894daab2203d979bb6e3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>