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

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

Change-Id: I92f9793aefc493d61b10622402339ac5f85acdd7