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0e1f616
(Get the code!)
I can as well confirm that I do not get tearing with compiz when I enable Force full screen redraws. I've used the video you posted to test – thank you very much for the link by the way.
I first started to experience tearing in 10.10. Although back then once I enabled vsync to be forced for OpenGL the problem disappeared for as long as I used compiz. In the new version of compiz (0.9.x) though, there are obviously some bugs concerning redraws – some regions of the screen often seem not to redraw properly as if they were wrongly marked as unchanged. This issue causes a multitude of problems one of which probably is that the tearing is now visible in OpenGL mode as well. At least the fact that the tearing disappears once we force full screen redraws seems to indicate this...
So I basically think we might be facing two issues here – one in the nvidia driver/x server that causes the tearing in the first place and then another one that now makes it happen in OpenGL mode with vsync enabled as well.