GridBaselineAlignment.cpp has code that is general to baseline alignment (BaselineContext and BaselineGroup) that is not specific to grid. We can separate these two classes out and use them in other formatting context like flex
<rdar://problem/109336789>
Pull request: https://github.com/WebKit/WebKit/pull/13868
Committed 264113@main (493db53c8c0b): <https://commits.webkit.org/264113@main> Reviewed commits have been landed. Closing PR #13868 and removing active labels.