GitLab

Includes a unit test. Also fixes some lint warnings.

BUG=792553
TBR=khushalsagar@chromium.org

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I4d582129d50bc2a7403b0bc0028bbf0ff4fd6b4e
Reviewed-on: https://chromium-review.googlesource.com/811627
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Bryan McQuade <bmcquade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522467}