Google has announced that the code for Chrome on iOS has been moved into the Chromium open-source repository.
Chrome for iOS has always been kept separate due to the fact that it relies on the WebKit rendering engine rather than Google’s Blink engine. This is because of Apple’s constraint on browsers on iOS, requiring all of them to run on WebKit.
“For Chromium, this means supporting both WebKit as well as Blink, Chrome ‘s rendering engine for other platforms.