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This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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This would require the compositor to support clip path on composited layers.

Feel free to WontFix it, because I don't think we'll add support for this. It would have the side effect of getting rid of mask layers for border radius. I suppose you could implement general clip paths with masks too, and we have a TODO for that in CompositedLayerMapping::OwningLayerClippedOrMaskedByLayerNotAboveCompositedAncestor.