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This adds a new vt_config_util.mm file which handles converting to
and from macOS color space information into a gfx::ColorSpace.

Most notably this adds support for HDR color spaces.

R=ccameron, sandersd

Bug: 1103432
Test: New tests.
Change-Id: I17f5c93276c1cc19a1623c007370e4f480bd2e0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336179
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794827}