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Previously Vulkan extensions VK_KHR_external_memory_fd and
VK_KHR_external_semaphore_fd were not enabled for swiftshader because
they were not supported. They are supported now, so they can be enabled.

Bug: 963988
Change-Id: I4d72fe965038615f19311e1e5bca5600b54035ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353930
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797768}