Bug 1410463 - Mark a frequent intermittent as random-if(webrender). r=me

MozReview-Commit-ID: 3jwx2OKL29n

layout/reftests/svg/smil/reftest.list

@@ -122,7 +122,7 @@ fuzzy-if(skiaContent,1,600) == anim-feGaussianBlur-01.svg lime.svg
 
 # animate some <angle> attributes:
 == anim-marker-orient-01.svg lime.svg
-== anim-marker-orient-02.svg lime.svg
+random-if(webrender) == anim-marker-orient-02.svg lime.svg
 
 #animate points list:
 == anim-polygon-points-01.svg anim-polygon-points-01-ref.svg