GitLab

Also fixup some documentation links for GPU optional bots.
Also change a PRESUBMIT.py's master name for win_angle_rel_ng.

TBR=kbr@chromium.org
TBR=sky@chromium.org

BUG=chromium:815092

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr
Change-Id: Ifda505e121f67f922f19da466a37b7f6266cea05
Reviewed-on: https://chromium-review.googlesource.com/1008182Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550188}