[RESTRICT AUTOMERGE] Check whether installerPackageName contains only valid characters am: 6dab15262b am: 9016bdf5eb

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

Change-Id: If46612bfb76bb86e6cb31016b755640ea7e3eecc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>