Merge "Add popup menu and click handling to taskbar." into sc-v2-dev am: 68953fc6 am: 4afdfb4f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16042092

Change-Id: I788326364e70659d1071f5e26acd1f61cc1feef5