CL/Vulkan: cl_khr_external_memory extension (pt.1) - Make this extension visible if Vulkan implementation support features supportsExternalMemoryFd and/or supportsExternalMemoryDmaBuf - Implemented APIs clEnqueueAcquireExternalMemObjectsKHR and clEnqueueReleaseExternalMemObjectsKHR - Updated clCreateBufferWithProperties to handle external memory file descriptor. Bug: angleproject:378017028 Change-Id: Idff08808bc0227b5f98b84c2086b68541665146d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6785087 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Austin Annestrand <a.annestrand@samsung.com>