Cleanup/Fence helper for Vulkan

Adds a class, VulkanFenceHelper, which allows for:
- Management of VkFences and querying of fences for status.
- Association of cleanup tasks with a fence, allowing for
cleanup tasks to safely be run.

Bug: 951768
Change-Id: I15ef3a94b90a833d4de55c0a5c41b709e29ae43e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1554289
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649970}