Merge "Overscroll plugin - give the plugin its own factory." into ub-launcher3-rvc-qpr-dev am: cbe1fc063d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/12353635

Change-Id: Ia471594443d1b744c5c34f0c9c45e7191bbf7938