When a game goes into fullscreen, shaders don't seem to scale with it.
I've noticed this in an Awesomium exported exe and in Chrome Version 22.0.1229.26 beta-m
I also tried it in Firefox, specifically Nightly build 18.0a1.
There it did scale, though I'm not sure it did so properly.
To test this I used the Haze shader example added in r101
I wanted to try out the Haze example in an Awesomium exported exe and inadvertedly noticed something. It seems that when you go fullscreen the shaders (or at least the warp one) doesn't scale with the change (if at all or not properly I don't know) to fullscreen.