Have a website with three.js on android/ios in a mobile openFrameworks app

You could try to compile first your OF project with emscripten (http://openframeworks.cc/setup/emscripten/), you will obtain an html page with a link to your OF project translated to js.
At this point, you can create a new js file with your threejs programm, link this file in the html page after the OF javascript file, and it should works.