Merge "Update launcher content animation to spec." into sc-dev am: cdc73b512e am: 121587eb13 am: 23ea316416

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14757888

Change-Id: I70ddc6e6e2268a08b1135fd75d4015a271323402