Merge "[snapshot] use caches for arraylists in mAppIds" into tm-dev am: 998d86ca am: 2fca7f73

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18152915



Change-Id: I09aa46b345f871a5d35b7ceb6bc80e3d852198b4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>