Merge "Update gesture nav tutorial back left and right videos" into sc-dev am: bef29071b5 am: de49434e13

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14969574

Change-Id: I8566132041b4bb48c46519a74f1e1bcb545dbce6