Merge "Polish the gesture navigation tutorial sandbox" into sc-dev am: cfa0baeca6 am: bd54f2bcb6 am: b20e7b8aed

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

Change-Id: I0983f2d33d37422677b9c565d6eddb2273fe73a7