setup robolectric for sysui am: fac84d7fdf

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20385101

Change-Id: I7db60773410137fe261d4518737ed2b936d0dd3c
Signed-off-by: Automerger Merge Worker <[email protected]>