Vulkan:Add trace marker in finishToSerial() Bug: b/156403378 Change-Id: Ibd50bc0448ba15af14191c3bc735782ab0741abf Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2197615 Reviewed-by: Tobin Ehlis <tobine@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Tobin Ehlis <tobine@google.com>