We should be able to build WebKit Chromium port from svn.webkit.org repository.
This will involve at least:
* figuring out how to deal with existing project dependencies (icu38, skia libjpeg, v8, etc.)
* moving (splitting out?) webkit.gyp to WebKit/chromium or someplace like it
* modifying update-webkit and build-webkit to work with --chromium switch.
This already works.