GitLab

Mark the original master as chromium.webkit and add
testing/buildbot changes.

BUG=790343

Change-Id: I11f61b9100f0879c9cb6d63119d7d508a9d779c7
Reviewed-on: https://chromium-review.googlesource.com/c/1262677Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Jao-ke Chin-Lee <jchinlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597318}