Merge "Update taskbar to spec" into tm-qpr-dev am: 39688d2d61

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20815395

Change-Id: I5d5cf3caadc6081d728948bb1674344714126363
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>