More notes about EGLStreams support:

- mutter 3.28.4 works, but not perfectly. Some clients (e.g.
glmark2-wayland) don't resize properly. That bug appears to be fixed in
mutter 3.30+. I don't yet know what commit fixed it.

- mutter 3.32 in future Ubuntu 19.04 won't work at all till we get this
package into main: https://launchpad.net/ubuntu/+source/egl-wayland and
then mutter rebuilt.

- mutter 3.30 in Ubuntu 18.10 and 19.04 work well enough right now
except for the below caveats...

- GLX clients are still software rendered in all releases, which should
be fixed by releasing egl-wayland into 19.04 and then rebuilding
Xwayland with the new build dependency.

- There is very high CPU usage in the kernel when using EGLStreams and
nvidia-drm.modeset=1 -> bug 1808108 (NVIDIA please investigate).

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https://bugs.launchpad.net/bugs/1805444

Title:
  [nvidia] Fail to launch gnome-shell (Wayland) on Ubuntu with EGLDevice
  backend

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