We account for the progress when blending transforms with additivity or accumulation, but we know that the progress in this case is always 1, so we should simply ASSERT().
Pull request: https://github.com/WebKit/WebKit/pull/6788
Committed 256997@main (da5d5fadcc44): <https://commits.webkit.org/256997@main> Reviewed commits have been landed. Closing PR #6788 and removing active labels.
<rdar://problem/102651774>