commit c2b67640577d505b89ea04d1e91a412d7293c0e6
author felkachang <felkachang@google.com> Thu Jul 19 20:06:50 2018 +0800
committer felkachang <felkachang@google.com> Thu Jul 26 10:16:12 2018 +0800
tree ec5983cfe0445397fd465947abc5596dab61ce32
parent c879386e5adbd155c56d5e5531b10ba7296f61dd

Fix the empty preference after clicking gear icon

Because there is no other options for 'None' or 'Swipe, there is no
necessary for showing the gear icon to show options.

'Lock screen message' could be found in
Settings > Display > Lock screen display.

Add testcase to verify the ChangeScreenLockPreferenceController's
behavior.

Test: make ROBOTEST_FILTER=ChangeScreenLockPreferenceControllerTest \
      RunSettingsRoboTests -j40
Change-Id: Icdcd672261749d106162053d6f5228cee420a810
Fixes: 110848852