Auto merge of #16665 - longsonr:1347409, r=heycam,emilio

Servo changes for bug 1347409

bug 1347409 is introducing a fallback type for SVG paint servers so that we can distinguish between url(something) and url(something) none and serialise those cases correctly. When we get a url(something) color we need to set the mFallbackType to eStyleSVGFallbackType_Color.

This change has already been reviewed in https://bugzilla.mozilla.org/show_bug.cgi?id=1347409

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