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This CL lands a tiny fix in the DisplayChangeObserver's: we should only
fill in the HDR DisplayColorSpaces if the monitor actually supports it.
I just stumbled upon it while debugging the next CL in the chain.

Bug: 958166
Change-Id: I3ee41501c04b692e12e1e96959a0d6cbf3c7489b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317815
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791406}