[signin] Add consistency_cookie_browsertest

This feature is only for Android, but unfortunately browser tests are not
run on Android. This should still exercise the code though.

Bug: 961601
Change-Id: Ia8ea6ffc0857ff1cf03d5a3a848edeb78b7647f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1605684
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660385}
2 files changed