We should add watchOS and tvOS to WebKit's public infrastructure. Of particular interest is EWS.
<rdar://problem/56477494>
Created attachment 401032 [details] Patch
Note that there are important steps to take when updating ANGLE. See http://trac.webkit.org/wiki/UpdatingANGLE
The patch on this bug is being broken up into multiple changes, but should be sufficient to build watchOS and tvOS both Simulator and device with a public SDK.
Everything has been landed, doing final verification locally before closing this bug.
I have verified the following all work: build-webkit --wathos-device build-webkit --wathos-simulator build-webkit --tvos-device build-webkit --tvos-simulator CI + EWS has confirmed I haven't broken iOS. I think it's time to close this bug!