GitLab

This CL adds a file to EG2 target and updates headers and adds eg2_test
source_set in build file.

Bug: 987646
Change-Id: Ia7e5b80e523d48d37b2552623529dc1e93fb0160
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871693Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Robbie Gibson <rkgibson@google.com>
Commit-Queue: Nazerke Kalidolda <nazerke@google.com>
Auto-Submit: Nazerke Kalidolda <nazerke@google.com>
Cr-Commit-Position: refs/heads/master@{#708951}