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After crrev.com/649520 VulkanSurface was failing with a DCHECK when
initializing on platforms that don't report currentExtent values for
VulkanSurface. Updated VulkanSurface::CreateSwapChain() to handle this
case properly.
Also added some extra checks when casting uint32_t value received from
Vulkan to int.

Change-Id: I33a1d1ff3dc40b12ed9f7951ec5068f791fc45a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1565249Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650469}