Create SystemUI Proofing Sample using RRO

Bug: 163075819
Bug: 162599873
Test: Manual
    First, build the RRO apk with the mmma command.
    Second, enable RRO for user 0:
    adb shell cmd overlay enable --user 0 com.android.systemui.rro
    Third, install the apk:
    adb install -r -g {PATH TO THE APK}
    Lastly, restart SystemUI.
    adb shell pkill -TERM -f com.android.systemui

Change-Id: I9a1296c37ba318505175d5c22ee0f820855779ef