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Test all the possible enum ColorModel values.

Bug: 1069537
Change-Id: Ie4fe38a0d97eeea14ad36644fe661936788042de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2150979
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759746}