[Bug 38652] VMR9 Owner and Clipping hwnd

https://bugs.winehq.org/show_bug.cgi?id=38652

--- Comment #1 from Jason  ---
I'm unsure, since my code is designed for windowless & windowed renderers, but
SetWindowPosition should either do nothing in windowless mode or move the
clipping window (not the Wine window implementing VMR9).  Once the Owner is
set, I can see the video window (class "IVMR9 Class") move inside the clipping
window as this function is called.

I think these differences are because Wine creates its own window for VMR9
windowless rendering, where Windows actually paints into the clipping window.