DEBUG in LatinIME has been changed by Ie52007dc to mean both
DebugSettings.PREF_DEBUG_MODE and Settings.PREF_KEY_IS_INTERNAL
instead of just DEBUG_MODE as used to be the case. Tests depend
on the debug mode to test many things and they make sure they run
in debug mode or they fail. This has tests understand the change in
policy.
Change-Id: Ie9f29e6a1d85e19704c8940d3fcf97c13c3dbaa6