Bug 552873: Re-enable random reftest, with an attempted workaround. r=tests-only

layout/reftests/svg/smil/mapped-attr-vs-css-prop-1.svg

@@ -1,7 +1,10 @@
 <svg xmlns="http://www.w3.org/2000/svg"
      xmlns:xlink="http://www.w3.org/1999/xlink"
      class="reftest-wait"
-     onload="setTimeAndSnapshot(1, false)">
+     onload="document.documentElement.setCurrentTime(1);
+             setTimeAndSnapshot(1, false)">
+  <!-- XXXdholbert the above "document.documentElement.setCurrentTime" call
+       shouldn't be necessary - it's a temporary workaround for Bug 552873 -->
   <script xlink:href="smil-util.js" type="text/javascript"/>
   <!-- This test consists of a 4x3 grid, containing various cases with
        animations that have attributeType="CSS" vs "XML", for the

layout/reftests/svg/smil/reftest.list

@@ -163,7 +163,7 @@ fails == anim-strokecolor-1.svg anim-standard-ref.svg # bug 436296
 == inactivate-with-active-unchanged-2.svg anim-standard-ref.svg
 
 # interaction between xml mapped attributes and their css equivalents
-random == mapped-attr-vs-css-prop-1.svg lime.svg
+== mapped-attr-vs-css-prop-1.svg lime.svg
 
 == smil-transitions-interaction-1a.svg lime.svg
 == smil-transitions-interaction-1b.svg lime.svg