Surface issues on macOS and iOS

[richard-lunarg]

On macOS and iOS, when the "Surface" tab is selected the display area just shows "Could not get a valid surface, no surface information available!".

Also, the Queue families tab, shows 'false' for all Queue families "Supports Presentation".

I've took a quick look at the code and think I can correct these myself and will contribute a PR sometime in the next couple of weeks. Just recording it here in case someone else is already looking at this, or comes along to report it in the next couple weeks.

[SaschaWillems]

I don't have any Apple devices to test this on, so a PR would be very much appreciated :)

[richard-lunarg]

This PR does the trick on both desktop and mobile devices.

#214

[richard-lunarg]

PR merged and this is fixed.