CL/Vulkan: cl_khr_external_memory extension (pt.2) - 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: I1751982c8e9b2cd07b7e251cc54db5dcd1bcda20 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6843980 Commit-Queue: Austin Annestrand <a.annestrand@samsung.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>