Failed UiModeManagerServiceTest

Added a mock and mockito helpers to remedy failed tests

Fixes: 151984124

Test: UiModeManagerServiceTest
Change-Id: Ic128ed9853f6f3b9f8641c1bec2a7c981e52865f
Merged-In: I09af78fd16662185d01aea427188f79527d47a9e
1 file changed