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Chrome canvas becomes blank after waking up from standby mode

@rtpg - the draw loop was continuing to run, but it would not display anything

For some reason the canvas would no longer update. I was unable to determine when the problem occurred but did figure out how to get the canvas to start displaying the images again. It was required that I resize the canvas (I change the width by one pixel) and then redraw (it's embarrassingly hackish). I current have it set to run every 30 seconds through setTimeout, but will probably change to window.onfocus once I can verify that gets called when coming out of sleep mode.

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