Macbook Pro Mid 2010 NVIDIA GeForce GT 330M random glitch showing when scrolling, writing or watching videos
I have experienced the same glitch.

This seems to be the problem reported here: https://code.google.com/p/chromium/issues/detail?id=359108

They claim it's an issue with Mavericks, GPU-accelerated graphics, and the NVIDIA GeForce GT 330M. I also have a mid-2010 Macbook Pro with the same graphics chip

This glitch started happening on mine after I upgraded to Mavericks. Also my Macbook started rebooting spontaneously every couple of weeks, with kernel panic messages about the GPU.

The suggested workaround is to go into Chrome's advanced settings, and disable the checkbox for "Use hardware acceleration when available" (second from the bottom). Then restart Chrome.

I just tried that myself, so I can't report that it works reliably yet.