Fix issue #17289876: startActivityFromRecents appears to launch the wrong task

It would be good to actually bring the task to the front.

Also, make the flow when inTask is provided better match what happens when
we go looking for a task on our own.

And this includes another fix that was supposed to be part of a different
change but I forgot this class is part of the framework project now.

Change-Id: I3cf05f2e585c0fd7a0dbb7c7cf9fb1655764dd93