Bug 260691

<rdar://problem/114420597>

Pull request: https://github.com/WebKit/WebKit/pull/17050

The lack of support for filters on Canvas makes Safari fails a number of tests

I can find 84 files mentionning ctx.filter on WPT
https://github.com/search?q=repo%3Aweb-platform-tests%2Fwpt+ctx.filter&type=code
It doesn't mean that all of them are relevant but some will fail.

I avoided the tentative, and I might have missed some of them.

http://wpt.live/css/css-paint-api/paint2d-filter-ref.html
https://wpt.live/html/canvas/element/filters/2d.filter.value.html
https://wpt.live/html/canvas/element/manual/shadows/canvas_shadows_system_colors.html
https://wpt.live/html/canvas/offscreen/reset/2d.reset.state.filter.html
http://wpt.live/html/canvas/element/manual/filters/canvas-filter-opacity.html
http://wpt.live/html/canvas/element/reset/2d.reset.state.filter.html
https://wpt.live/html/canvas/offscreen/reset/2d.reset.render.misc.html
https://wpt.live/html/canvas/element/manual/filters/canvas-filter-shadow-and-properties-blur.html
https://wpt.live/html/canvas/element/manual/filters/canvas-filter-opacity-alpha-and-fillStyle.html
http://wpt.live/html/canvas/element/manual/filters/svg-filter-lh-rlh.html
https://wpt.live/html/canvas/element/manual/filters/canvas-filter-shadow-and-properties.html

This is already implemented in 280148@main.

*** This bug has been marked as a duplicate of bug 273923 ***