Initial commit of 3 button work am: 16fd85629d am: 35d67239f7 am: fddee817cd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13989017

Change-Id: I3308a615226a3f63f4d9ecb1c3f71285e0b6f582