Collect canvas ads with screengrab

[dhowe]

The idea would be to check for a canvas inside a hidden element, then if it is found (and there is no other ad image), then convert to image url (theCanvas.toDataURL('png')), then save somewhere to a file.

We might try something similar (some day) with video ads...

For now lets just save examples here:

http://radikal.ru/lfp/s019.radikal.ru/i623/1608/e3/622e5cf04089.jpg/htm

[mneunomne]

@dhowe I was checking this the other day, making some tests. The tricky thing is that the canvas needs to be visible for it to be grabbed, our cosmetic filters dont enable that. Plus to grab image from canvas is super processing heavy.