We should set up WebCore to start allowing files to be unified source built. This probably won't actually build any files with unified sources to start but will have all the tooling needed to get started.
Created attachment 324078 [details] Patch
Created attachment 324085 [details] Patch
Comment on attachment 324085 [details] Patch rs=me
Comment on attachment 324085 [details] Patch Clearing flags on attachment: 324085 Committed r223621: <https://trac.webkit.org/changeset/223621>
All reviewed patches have been landed. Closing bug.
<rdar://problem/35057625>