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c0c12a759e
Attempt to speed up vulkan startup by ensuring vulkan driver initialization happens on raster thread. Prev. we immediately initialized the impeller::Context, unfortunately setting up the vulkan context can take upwards of 100ms. This time is running on the platform thread and blocking startup. Instead, I attempt to hide/defer as much as possible what backend is being used - this requires us to access the impeller context via a shared_future in some cases instead of immediately knowing it is valid.