Merge "Refactor taskbar divider view to IconButtonView" into udc-qpr-dev am: 6341a7e31c am: 5150489fc0

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/24448722

Change-Id: I9f2651ebb0df4053c421f34cc49053a9fe5a8726
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>