This will make them easier to maintain. Add to add new features.

Bug: angleproject:2964
Change-Id: I8c1f92e0d0ca15fc4f555f6c537fa9311320ef7d
Reviewed-on: https://chromium-review.googlesource.com/c/1334429
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>