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This change begins adding test coverage (still quite incomplete) for
//ui/views/color_chooser.

Bug: None
Change-Id: I7ef91fe5b276e90f7e3bd13fcb153b66f90d72c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406390
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818002}