I’m currently making the same thing using this presentation and slides
It’s in russian, and I don’t know if you’re able to understand it, but they actually made a working post processing stack with motion blur, bloom, fullscreen lens flares and screen distortion effects that run 30 fps on Galaxy S2.
There’s also a thread regarding this Post Process Mobile Performance : Alternatives To Graphics.Blit , OnRenderImage ?
However, I can’t make a simple fullscreen quad rendering to work. Post Processing with Graphics.DrawMeshNow. Problems with render-to-texture
Once I got it working - it can be turned into a lightning fast mobile bloom. It will be much faster than built-in PostProcessing Stack bloom and won’t depend on screen resolution. So this is definitely a way to go.