desaturate-effect: Do not inherit from ShaderEffect
desaturate-effect: Do not inherit from ShaderEffect

Hide the fact that we're using a fragment shader, in case we're able in
the future to use a material layer combine function when painting the
offscreen target texture.

heysion/clutter-clone,heysion/clutter-clone,heysion/clutter-clone,collects/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,collects/clutter,jigpu/clutter,djdeath/clutter-android,kerrickstaley/clutter-vala,kerrickstaley/clutter-vala,Distrotech/clutter,ebassi/clutter,jigpu/clutter,djdeath/clutter,spatulasnout/clutter,collects/clutter,ebassi/clutter,heysion/clutter-clone,jigpu/clutter,djdeath/clutter,djdeath/clutter-multithreaded,ebassi/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,nobled/clutter,djdeath/clutter,collects/clutter,jigpu/clutter,spatulasnout/clutter,Distrotech/clutter,djdeath/clutter-android,djdeath/clutter-multithreaded,djdeath/clutter-android,nobled/clutter,ebassi/clutter,djdeath/clutter,dlespiau/clutter,djdeath/clutter,djdeath/clutter,GNOME/clutter,jigpu/clutter,dlespiau/clutter,heysion/clutter-clone,GNOME/clutter,spatulasnout/clutter,nobled/clutter,collects/clutter,Distrotech/clutter,GNOME/clutter,spatulasnout/clutter,spatulasnout/clutter,GNOME/clutter,djdeath/clutter-multithreaded,djdeath/clutter-android,dlespiau/clutter,GNOME/clutter,Distrotech/clutter,jigpu/clutter,djdeath/clutter-android,ebassi/clutter,djdeath/clutter-multithreaded