Check mode/boost index before accessing cached support value am: 20b47da57a am: c188fc2ed9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13164079

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iec6190e3ec6f9da1589647b7a27ed80775d9c6df