This is preparation CL without introducing any functional change. This
Cl wraps barrier data into its own class and put necessary data
structures in place. It still uses one vkCmdPipelineBarrier call.

Bug: b/155341891
Change-Id: If9c70d24873bd9b89e598acfba2eeee364f0b6c1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2185149
Commit-Queue: Charlie Lao <cclao@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>