Merge "Cache shadow shaders for showing shadier shapes without shaky shinanigans" into sc-dev am: 3f3b607d am: 37931347 am: 979d405f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15189838

Change-Id: Ib8ebd04e9eab80a6bedef721c7a051977378d9a3