Its including stuff thats only relevant when ENABLE(WEBGL) is on.
Pull request: https://github.com/WebKit/WebKit/pull/4386
Committed 254531@main (c869e4e0c63f): <https://commits.webkit.org/254531@main> Reviewed commits have been landed. Closing PR #4386 and removing active labels.
<rdar://problem/99988896>