Vulkan: Distinguish query operations in GraphViz output The query nodes now output BeginQuery or EndQuery based on the node's function, instead of just Query. Bug: angleproject:2379 Change-Id: I6ba38031c40b88e8927b31cdf14e4fdc2474624e Reviewed-on: https://chromium-review.googlesource.com/c/1277485 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>