Add VK_KHR_external_memory &  VK_KHR_external_semaphore for vulkan device

Without those two extensions, vulkan validation layers will report errors

Bug: None
Change-Id: I1117fc03c3d322b3e51955591fea13b4db247a71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1662836
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#669913}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 85dab00eb27d18020405587e2be225a9f96a112b
1 file changed