Only consider hiddenRequested when deciding layout

This change removes the test for hidden when deciding whether to
do a layout. So layout begins as soon as hiddenRequested occurs.
Since hidden is cleared when animations starts considering hidden
in the layout decision will delay layout until it is too late.

In particular we were not executing a relayout on return to an
activity even though the screen had been rotated while away.

Fixes bug 6615859.

Change-Id: I5fb0b4bf2c253b910a7a192da04419236d8f09d9