The function ANativeWindow_fromSurface() takes a jobject that is
supposed to be a Surface. Prior to bug 1706656 GeckoSurface was a
subclass of Surface, meaning we passed the correct type. However,
GeckoSurface no longer derives from Surface meaning we hit this JNI
crash.
To fix this, call GeckoSurface->GetSurface() to get the underlying
Surface object.
Note that this code path is only active if the user has modified the
pref gfx.use-surfacetexture-textures. So although the volume is high,
it appears to be limited to a small number of users.
Differential Revision: https://phabricator.services.mozilla.com/D167659
5c4015fd4f