Refactor the existing PaintGradient method into a nsCSSGradientRenderer class. The purpose
of this is to separate the calculation of gradient parameters from the painting of the
gradients. This should help us to share code between WebRender and our existing
painting code. It does not change how we render gradients currently.
MozReview-Commit-ID: 4P8vPqK4V8g
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extra : rebase_source : 031cd8d15148153b0af23fa9ff0abbf037d028db
Wes Kocher
Ryan Hunt
Markus Stange