GitLab

Introduce a Dep as a manager of external states for easy testing.

Bug: 1109255
Change-Id: I74cf6cac126a6f8ed4c6f9144131443e1ba57722
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2385982Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Commit-Queue: Lijin Shen <lazzzis@google.com>
Cr-Commit-Position: refs/heads/master@{#804424}