Why Unity doesn't remember edge bindings settings from Compiz?

Okay here it is.

1. "Why is it happening?"
   • It's a bug, already reported https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/752687

2. "How to fix it?"

   • Here I'll share two answer, that solves my edge binding problem for my 12.04.
     But, it might not work on other computer.
     

   First

   • One problem that I found is, python-compizconfig, which is Compizconfig bindings for python is not included with compizconfig-setting-manager.
     • So you have to install it manually, or, it will be automatically installed with Ubuntu Tweak (That's why I recommend you Ubuntu Tweak).
     • With Ubuntu Tweak, you can find the edge binding settings under Tweak > Workspace.
       

   

   Second

   • Another one is taken from @sachinr's answer.
     

     Add Compiz to the startup applications.

     Name    : Compiz
     Command : bash -c "sleep 3; compiz --replace"
     

Now with those, my edge binding settings "remembered" whenever I start a new session.