Update task surface visibility with reparent for pip

When a pip activity is reparented to its original task on top,
the task becomes visible because now it contains a visible activity.
This happens when leaving pip to fullscreen, i.e. finishTransition.
Currently the reparent operation is not included in a transition,
so the surface operations use pending transaction. But there can
be a orientation change happens in finishTransition, which triggers
to start collecting all visible tasks, which will make them use
sync transaction. Then if prepareSurfaces is called after that,
the "reparent" and "show" will be applied by different transactions.
Which could causes to flicker. So this change makes sure the
"reparent" and "show" are applied in the same transaction.

It was lucky that surface placement contains all prepareSurface,
since it was optimized out, invoke it explicitly.

Bug: 335046662
Test: Enter pip from a task which contains multiple activities.
      Expand the pip activity from portrait to landscape.
      The task should not disappear a few frames.
Change-Id: I48021aecf64311016747c58d1fdcb9e3381e5f92