Also, more directly go from StyleImageRendering to wr::ImageRendering.
* image-rendering: smooth the non-deprecated version of
OptimizeQuality, which maps to SamplingFilter::LINEAR /
wr::ImageRendering::Auto (which uses gl::LINEAR).
* image-rendering: pixelated maps to wr::ImageRendering::Pixelated /
SamplingFilter::POINT which is the same crisp-edges does.
Note that this uncovers that we were mapping image-rendering:
crisp-edges to wr::ImageRendering::Pixelated.
I'm going to preserve behavior on this patch but we should consider
switching that to map to wr::ImageRendering::CrispEdges on a
follow-up (filed bug 1728831 for this).
Differential Revision: https://phabricator.services.mozilla.com/D124378
70f53c85d4