GitLab

This CL adds concurrent experiments for stable and beta to the field
trial configuration.

Change-Id: I83a0afef311d3df2f8881ce2684cf86847660372
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2452474
Commit-Queue: Matthias Körber <koerber@google.com>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814704}