Add field trial testing config for ios cellular uma change

Bug: 1154678
Change-Id: Ib1f440dbba8b5cd2f8c5f7d580ba90e31cce9d1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2845109
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#875183}
GitOrigin-RevId: bcd443866b0bef5dcb0febd6b3638d3577ed8333
1 file changed