Fix layout state issues.

- Restore test of hidden to isGoneForLayoutLw(), without that
we return false when setAppVisibility(true) is called which leads
to early layout of windows. Particulary on return from full screen
to non-full we lay out once before recognizing that the status bar
should be back and then again once the status bar appears causing
a jump. Fixes bug 6470541.

- Add a new test for configuration size changes to gone or hidden
windows. This forces a layout call to these windows which informs
them of the new size even though they are not shown until later.
In particular this keeps windows that were in the background
during a rotation from using their old boundaries on return.
Fixes bug 6615859.

- Consolidate WindowState.mConfiguration tests into WindowState.

Change-Id: I7a82ce747a3fcf7d74104dc23f1532efe64bd767