Implement color-gamut media query

This is implementing the following specification:
https://drafts.csswg.org/mediaqueries-4/#color-gamut

Intent to Implement and Ship:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/36CcloDrB3E/1wMSNMl9BQAJ

BUG=685456

Review-Url: https://codereview.chromium.org/2652313004
Cr-Commit-Position: refs/heads/master@{#446946}
17 files changed