Merge "Add popup menu and click handling to taskbar." into sc-v2-dev am: 68953fc6 am: a3e2aa24

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

Change-Id: If13b717ca2dbb2b3e4030ceb26578bfc56bc4c28