GitLab

Add 'use_color_pipeline' build flag to enable building with color
pipeline feature. Excluding color_unittests so it can continue running
on buildbots without config changes.

BUG=1003612

Change-Id: Ie90fe5da6671a0f0d3d0f93bdbb5dc1df8497ce0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1928308Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718901}