More infinite/NaN handling for <canvas> API members

[annevk]

From #1790 (comment):

@zcorpan The list given above doesn't look complete to me. It's missing:

• shadowOffsetX
• shadowOffsetY
• shadowBlur
• lineWidth
• miterLimit
• setLineDash
• lineDashOffset

at first glance.

There might be more missing as this is from Firefox implementation which may not have everything implemented yet.

We also forgot to file a WPT issue.

[zcorpan]

Those are IDL attributes which already had explicit handling of infinite/NaN I believe.

[annevk]

Indeed. I guess the only thing remaining is WPT then.