Comma separation in functional syntax (filters, transforms)

CSS Filters [1] is using a comma-free syntax for arguments to the filter functions. This leads to things like:

  filter: gamma(0.5 0.2 0.2);

I think it's wrong for this to be different to transforms[2], which currently uses commas. We have to do one or the other, not mix and match.

Simon

[1] https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#FilterFunction
[2] http://dev.w3.org/csswg/css3-2d-transforms/