This is in preparation for being able to qualify for a visually non-empty content without looking at geometry.
<rdar://problem/59562169>
Created attachment 391087 [details] Patch
Comment on attachment 391087 [details] Patch r=me
Comment on attachment 391087 [details] Patch Clearing flags on attachment: 391087 Committed r256883: <https://trac.webkit.org/changeset/256883>
All reviewed patches have been landed. Closing bug.