Improve grid preview performance am: b023873bc3 am: a1d5ebefbf am: d6d2a4da11

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/12153148

Change-Id: Ibfe60a29691acd7f446f22f2b3bab2653abdcc7e