[webkit-dev] Turning CSS Variables Off

[Bear Travis]

Hello WebKit,

There has already been some discussion about removing the CSS Variables code [1], and some early looks at what removing it from the code base would look like [2].
Currently, the EFL and GTK ports enable CSS Variables in the Source/cmake/Options[Efl/GTK].cmake files. I am proposing turning them off and excluding the CSS Variables tests until someone steps up to maintain the feature, or the feature is removed.

I am proposing this as the cost of leaving the feature enabled is non-zero. The feature is incomplete and bugs are going to surface. Today I had a test regression with a css variables + exclusions test because the test and behavior were incorrectly implemented [3]. This regression turned up when it caused the bots to fail, and had to be diagnosed by today's gardener, and then forwarded to me to be fixed. I don't think this cost is worth it for a feature we are not (at least to my knowledge) planning to actively implement.

-Bear

[1] https://lists.webkit.org/pipermail/webkit-dev/2013-April/024476.html
[2] https://bugs.webkit.org/show_bug.cgi?id=114119
[3] https://bugs.webkit.org/show_bug.cgi?id=116059
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