Support WinRT API - CompactOverlay aka PIP mode

[meteorsnows]

If it possible to support WinRT API CompactOverlay? Any Sample for UWP project? Because UWP project access all WinRT API instead of partial. Been wanted to give user choice of Always on top with old Win32 API and Windows 10 API.

bool modeSwitched = await ApplicationView.GetForCurrentView().TryEnterViewModeAsync(ApplicationViewMode.CompactOverlay);