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This CL adds a ParseChromaticityCoordinates() service function to the
bunch of edid_parser.cc functions, and adds unittests with a few real
EDIDs collected in the wild.

ParseOutputDeviceData() in that very file is minimally refactored
for early-return.

R=edid_parser_fuzzer

Bug: 771345
Change-Id: I956609d381b6fb199021b725f3838f55fb1fda48
Reviewed-on: https://chromium-review.googlesource.com/699351
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506876}