Code review comment for lp:~jsjgruber/nux/lp1167018

This has been built for testing in ppa:jsjgruber/ppatwo.

To test (on the affected Radeon GPU):

1. Install the associated package.
2. Use ccsm to turn on active or static blur.
3. Press the "Super" or Alt button or bring up the Logout dialog box. Any
   of these should bring up a blur of the underlying screen on which to
   interact.