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This CL wires EDID's bits per channel indication to DisplaySnapshot,
ManagedDisplayInfo, and DisplayManager.  This is needed as a first
step to create 10 bit per component/30 bit depth framebuffers for
monitors that support it such as [1] or HP z32x.

[1] https://paste.googleplex.com/4515759143256064

Bug: 949260
Change-Id: Ic30c34099da68f9ec9a7e099e5136b945aab6879
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733887
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689131}