Patch by Robert Mader [:rmader]
This enables support for EGL on X11, toggled by setting the
MOZ_X11_EGL env variable. It allows running the Webrender
and OpenGL compositors basically like we do with GLX by default.
Note that that there are several things missing:
- no pixmap sharing support (not clear if we want/need it)
- it still uses GLX for several things like finding the X11 visual, VSync and glxtest.
It includes some cleanups, mostly in order to decouple the X11
and Wayland implementations a bit more.
Differential Revision: https://phabricator.services.mozilla.com/D76417
Jeff Gilbert
Mihai Alexandru Michis
Andrew Osmond
Martin Stransky