GitLab

The onboarding screen has two separate flows that need to be logged
distinctively for metrics.

BUG=1144056,1106937

Change-Id: If36d91a2f734c1f89f49fe2eae500283151ed184
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519155Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824111}