GitLab

This CL adds all signin settings tests to EG2 target
and updates headers and adds eg2_test source_set in
build file. New app interface for signin settings
tests is being introduced.

Bug: 987646

Change-Id: I6d888342c059b8b1767e910697b3f4d1a9b483e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903192
Commit-Queue: Nazerke Kalidolda <nazerke@google.com>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Auto-Submit: Nazerke Kalidolda <nazerke@google.com>
Cr-Commit-Position: refs/heads/master@{#720941}