Merge "Polish the gesture navigation tutorial sandbox" into sc-dev am: cfa0baeca6 am: 472a993d6b am: 865c277598

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14924450

Change-Id: I15961242ece5ab619f6dc815c59943491f9ab2c6