PopupWindow: Resolve measure specs before passing to WM.

For the setClipToScreen case we need constraint to
the available display area, but not to the parent window.
If we don't pass FLAG_LAYOUT_NO_LIMITS, we will be constrained
to the parent window. However when we do pass it, we will
not be constrained to the system insets. So, we can pass
FLAG_LAYOUT_NO_LIMITS and constrain ourselves to the insets
via getWindowVisibleDisplayFrame. We also need to avoid
calling setWidth/Height with these resolved values
so we can preserve the indeterminate values in case
layout changes (e.g. rotation).

Bug: 29166136
Change-Id: I4c7c6204e6bc1cdcf4ad86f7e99e3511d4312ae4