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This CL wires 3 display/monitor fields from EDID parsing
to the Chrome private API where they surface, as described
in the DD [1], namely:
1- manufacturer id
2- product id
3- year of manufacture.

(Note that ToT Ozone DRM already parses this list's 1 and 2;
this CL adds code to parse 3). A diagram of the touched areas
is in the DD [1] extracted for quick access in:
  https://i.imgur.com/yx8H0R3.jpg (also [2]).
but in a nutshell: Ozone DRM creates a DisplaySnapshot from
the EDID, and passes it to Browser Process via Mojo and/or IPC
(being migrated); in Browser DisplayChangeObserver transforms that
snapshot into a ManagedDisplayInfo, and in turn passes it to the
DisplayManager that creates a Display that is used later on upon
request by DisplayInfoProviderChromeOS to fill in the JS data struct.

There's a bit of confusion on ToT between product_id and
product_code, so this CL follows the spec and aligns them all,
i.e. EDID parser produces a |product_code|, which is a pack of
the manufacturer id and product id.

Unittests extended, tested on soraka+simplechrome.

[1] go/js-edid-chromeos
[2] https://imgur.com/a/aqNDD

Bug: 821393
Change-Id: Ia219b4eeb92cf3eae3e58046340f1b81c34c9ea2
Reviewed-on: https://chromium-review.googlesource.com/959547
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543512}