Update visibility logic in realStartActivityLocked

ActivityStackSupervisor#realStartActivityLocked method is updated
to perform some actions regardless of whether we're making acitivity
resumed or not. This is possible because at the end in either way
activity will be visible.

Bug: 29619461
Test: Manual
Change-Id: If83ee38683e7ece52a0ae0a70bec0bdce6a195d3