I'm very happy to announce that the entire ios/web/ layer has now been upstreamed, including the ios_web_shell target.
ios/web/ is the iOS analogue of content/ (based on the system web view rather than Blink) and ios_web_shell is, like content_shell, a minimal embedder. This means that for the first time it's possible to build an iOS app from the Chromium tree that actually lets you browse the web!
The web/ layer is still in some ways a work in progress, as it is much newer than its cousin content/, but now the remaining work (fully defining the public API, completing internal refactoring to better match the structure of content/, removing a few lingering internal dependencies on content/, continuing to explore the use of WKWebView) will be happening in the Chromium tree.
A huge thanks to everyone who helped get the project here, both in carving out the web layer downstream in the first place, and in helping cleanly unfork all the layers underneath web/ upstream.
Lastly, for anyone looking forward to the iOS version of the recent announcement about the Chrome for Android UI layer being public, I encourage you to get involved with
componentization so that day can come sooner!