GitLab

With the current default value fetching_requires_signin=true, users get
suboptimal UX after fresh install / after clearing app data. Because of
bug 632199, the server-side variation parameters are not applied in the
first run and sign-in is required. This is inconsistent with the second
run of Chrome, where the server sets fetching_requires_signin:=false
and no sign-in is required any more.

BUG=646759

Review-Url: https://codereview.chromium.org/2343583002
Cr-Commit-Position: refs/heads/master@{#419147}