Code review comment for lp:~vanvugt/compiz-core/fix-880707.2

OK, I think there's been enough discussion here.

I'm confident with the changes this branch is introducing, and think we just need to land it now. I have created an entire testing framework for it, which can be found at lp:~smspillaz/compiz-core/compiz-core.fix_880707.2.test . That test tests for both phase and period timings. On a period of aggressive vblank scheduling for 70 seconds, that test passes each time on my machine.

The testing branch will need to land a little bit after the main one does, once Daniel is ok with it, but ideally it needs to be in before feature freeze.