Vulkan: Initial command queueing implementation. This removes the sychronous operation of the command buffers. It also introduces a serial type for assigning ids to queue operations. This gives us the ability to manage lifetimes of resources and track when they're no longer in use on the device. BUG=angleproject:1898 Change-Id: I91a4836d3098f1d7bd06cd389d88601a3a4826ab Reviewed-on: https://chromium-review.googlesource.com/428352 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>