We have duplicated logic in [devtools](https://searchfox.org/firefox-main/rev/4b63e8e14125558cd75be1a53b6fc40b48cc2560/devtools/shared/css/color.js#722-745) and [graphics](https://searchfox.org/firefox-main/rev/4b63e8e14125558cd75be1a53b6fc40b48cc2560/gfx/src/RelativeLuminanceUtils.h#42-50). We can dedupe.
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We have duplicated logic in [devtools](https://searchfox.org/firefox-main/rev/4b63e8e14125558cd75be1a53b6fc40b48cc2560/devtools/shared/css/color.js#722-745) and [graphics](https://searchfox.org/firefox-main/rev/4b63e8e14125558cd75be1a53b6fc40b48cc2560/gfx/src/RelativeLuminanceUtils.h#42-50). We can dedupe by calling the graphics util in InspectorUtils.