GitLab

This CL uploads the markdown doc and diagrams. It does not cause
behavior change to code.

Bug: None
Change-Id: Ica44a4a82c8af951b5ad6d79e760ebeb0cceae71
Reviewed-on: https://chromium-review.googlesource.com/1054165Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Olivia Lai <xlai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558343}