Mark activity as visible and not stopped after resume-relaunch.

After a resume-relaunch, the activity is assumed to be in resumed state,
and we'll not run the normal code for resume. But it needs to be marked
visible otherwise it will stuck in invisible state.

Also trade some AM traces for WM traces for further debugging.

bug: 27123118
Change-Id: I50ce5cde29f441115675db54523090ef86d95ea8