Add a test enumerating all the possible behaviors of the various context2d backends Makes it simpler to check how a change to the parameters affects various platforms.
<rdar://problem/115425330>
Pull request: https://github.com/WebKit/WebKit/pull/17733
Committed 268015@main (d68b93c03cfe): <https://commits.webkit.org/268015@main> Reviewed commits have been landed. Closing PR #17733 and removing active labels.