Considering the current implemention constraints that applications have
to access various device files for GL (eg, /dev/dri/card0) instead of
having something trusted like mir do the direct access (see bug #1197133
for background), I don't think we can avoid this access:

  /sys/devices/pci[0-9]*/**/config r,

While https://www.kernel.org/doc/Documentation/filesystems/sysfs-pci.txt
tells us it is rw, AppArmor can at least enforce readonly.

It is fine for webbrowser-app to /sys/devices/pci[0-9]*/**/config, but
before we add it for all applications, can you give the complete denial
messages? Perhaps there is something more fine-grained we can use....

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https://bugs.launchpad.net/bugs/1590561

Title:
  webbrowser-app crashes on startup on fresh zesty Unity8: No suitable
  EGL configs found

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