Looking at the video and time it took to launch the calc.exe, it could be pdf/flash exploit that they are using.
Process count in process explorer started with 5 and at the end of the demo, it looked like they have 8. That tells there are 2 extra processes that are created (discounting 1 for calc.exe).
I tried to see if pdf/flash creates new processes but I couldn't verify. Perhaps a chrome developer could get a clue about what is happening looking at the video.