And move it to its own header, since we are including TextureMapper.h in several places where we only need the flags.
Pull request: https://github.com/WebKit/WebKit/pull/19829
Committed 270051@main (bcb36a613468): <https://commits.webkit.org/270051@main> Reviewed commits have been landed. Closing PR #19829 and removing active labels.
<rdar://problem/117791890>