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This CL adds code for populating the necessary gfx::DisplayColorSpaces
in CreateManagedDisplayInfo for supporting SDR and HDR target color
spaces (depending on the monitor capabilities and the big hdr flag).

It needs a sibling CL to allow AR/B30 FBs on CrOs crrev.com/c/2078655,
Tested with that CL and by playing an HDR video: the primary
framebuffer format in /sys/kernel/debug/dri/0//state correctly changes
to XB30, whereas when there are not HDR quads in the BufferQueue, it's
XR24.

Bug: 958166
Change-Id: I94638436c079b03ef9f6200b77697b1d3da9337e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2072621Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745461}