GitLab

Also adds distributionUrl=, which my Android Studio told me is now
necessary :/

Also enables warnings via gradle.properties. Without this, I just get
a warning saying:
  "There was a warning, but to see it you need to enable warnings".

Bug: None
Change-Id: I7064ee3a82666866a56d2d69e04563fb7c7e44d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216323
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772373}