Merge "Update launcher content animation to spec." into sc-dev am: cdc73b512e am: db846e1e47 am: 5a48d3a283

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

Change-Id: Ia2883b1581296e691b982dcf5c761a9eec3ecf0f