Comment 29 for bug 49613

+ exposeEvent.drawable =
(Drawable)win->GetNativeData(NS_NATIVE_WIDGET);

You want NS_NATIVE_WINDOW so that this can work in GTK1.

Other than that, this looks pretty good on the painting side. But the event
handling is missing. You need something like this:

http://lxr.mozilla.org/mozilla/source/layout/generic/nsObjectFrame.cpp#3883

Fix that and I think we're close to having something we can check in ... need
testing from the Macromedia folks though, really.