GitLab

This CL migrates the trunk/branch builders:

CI:
- GPU Win x64 Builder
- Win x64 Builder
Try:
- win10_chromium_x64_rel_ng

Schedule of migration:
https://docs.google.com/spreadsheets/d/1TZhpasm6iceYm7zqkyEtZ1wn9ZcpREfH4LV4cusICJA/edit#gid=0

Bug: 950413
Change-Id: I0a688a919a1199a583200ce8d4928777c03b7370
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1965739Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729571}