Vulkan: Merge command paths in submitFrame. This makes the CommandQueue and CommandProcessor paths nearly the same in submitFrame. The end goal is to make them take identical input parameters. Bug: b/172704839 Change-Id: If3ef2752534de1c3dcaefa5730b308aea46e549e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2524545 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Tim Van Patten <timvp@google.com>