Matthew Waters cd28c77413 vulkan/window/ios: fix race on window startup
1. The iOS create_surface implementation needs to call out to the main
thread to create the window (UIKit requirement)
2. get_surface() can be called and will attempt to create the VkSurface
from an invalid view/layer.

Also pass the layer for MoltenVK so we don't get pesky 'UIView function
not called on main thread' warnings.
2019-09-16 03:15:39 +00:00
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