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Chrome OS does not have the VK_KHR_surface or VK_KHR_swapchain
extensions. Move them to implementation specific code to allow
initialization of vulkan on Chrome OS.

Bug: 851997
Test: vulkan ozone_demo on linux x11

Change-Id: I5355a1f7e6d5215b98aba2defc8e4d631f6a964e
Reviewed-on: https://chromium-review.googlesource.com/1104860
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Chris Blume <cblume@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569416}