Function vkGetSwapchainTimingPropertiesEXT 

pub unsafe extern "system" fn vkGetSwapchainTimingPropertiesEXT(
    device: VkDevice,
    swapchain: VkSwapchainKHR,
    pSwapchainTimingProperties: *mut VkSwapchainTimingPropertiesEXT,
    pSwapchainTimingPropertiesCounter: *mut u64,
) -> VkResult

Available if built with prototypes.