[Chrome Colors] Add Chrome Colors flag and feature

Bug: 960982
Change-Id: I34059e493332e6dca9ed9e1fa91babd916523948
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601636
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658660}
10 files changed