It's not enabled to do anything yet.
Just create a one-pixel dummy surface for eglMakeCurrent().
Move the private Backend API to a separate header. This also allows us to finally move the class vtable and instance structure to a separate file and plug the visibility hole that left the Backend class bare for everyone to poke into.
This adds a clutter backend for running under the wayland window system. Initial cogl framebuffer integration by Robert Bragg.
