This is a master bug to track progress on the effort. There will be three builders for each platform: Mac, Win, Linux.
In order for this to happen, we must first:
* Complete WebKit API (bug 28394)
* Implement DRT for Chromium port (bug 28395)
* Decouple Chromium port build system from Chromium (bug 28396)
* Upstream Chromium baselines and expectations (bug 28397)
See https://trac.webkit.org/wiki/Chromium for pretty pictures.