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The concept of "the color space of the display" falls apart on several
platforms, because display (or OS) can be configured to handle multiple
color spaces. Rather than sending a single color space, send a set of
color spaces to use in various situations (sRGB-only content, SDR WCG
content, and HDR content).

Use this gfx::DisplayColorSpaces structure in display::Display, instead
of using gfx::ColorSpace and sdr_white_point. Also communicate this
via mojo, which had not been done in the past.

For now, only use the "HDR transparent" color space. The next patch
use this structure in ui::Compositor, viz::Display, and
viz::SurfaceAggregator. This structure is added to gfx because it is
imported from these several locations.

Bug: 1037954, 1038770, 1038494, 958166
Change-Id: I677e3f5c4d01deeb95f76b6463541eec2163b48b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006068Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732874}