Merge "Persist prediction cache on every update" into ub-launcher3-rvc-dev am:...

Merge "Persist prediction cache on every update" into ub-launcher3-rvc-dev am: 1cc0010e am: 21ff5c4f am: 44b7b638

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/12077679

Change-Id: Ife9f1729cf9299043330058b5e6a7f2ad387e85b