I found that the getting started instructions are not quite accurate: https://bitbucket.org/chromiumembedded/ ... ndBuilding
As of JCEF(3.3071.1644.g408afd1) you need Python 2.7.X in order to follow these instructions step by step. Otherwise you get an error that might throw off developers for a while until they figure it out.
In particular I am using pyenv to control my python version so that the correct one is picked up when calling
> cmake -G "Xcode" -DPROJECT_ARCH="x86_64" ..
Found PythonInterp: /Users/username/.pyenv/shims/python (found version "2.7.8")