CrOS: add flag to enable using HDR transfer functions when present

This CL adds a flag to explicitly enable using the HDR monitor(s)
EDID-provided transfer function, if present at all. By default
this flag is disabled because blindly using an HDR transfer makes
HDR content look great and SDR content look faded (naive SDR-HDR
mixing). The idea is to enable the flag for development.

Bug: 1012846
Change-Id: I4d21aafa0a2b6114f68dc6a3615f72674dc0979c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872794
Reviewed-by: Avi Drissman <[email protected]>
Reviewed-by: Mitsuru Oshima (slow) <[email protected]>
Commit-Queue: Miguel Casas <[email protected]>
Cr-Commit-Position: refs/heads/master@{#708587}
9 files changed