Fix and enable reftest for Bug 964200

layout/reftests/svg/filters/feDropShadow-01-ref.svg

@@ -30,7 +30,7 @@
     <filter id="dropShadow3">
       <feGaussianBlur in="SourceAlpha" stdDeviation="2 5"/>
       <feOffset dx="5" dy="5" result="offsetblur"/>
-      <feFlood flood-color="green" flood-opacity="0.5"/>
+      <feFlood flood-color="green" flood-opacity="0.2"/>
       <feComposite in2="offsetblur" operator="in"/>
       <feMerge>
         <feMergeNode/>

layout/reftests/svg/filters/feDropShadow-01.svg

@@ -17,7 +17,7 @@
     </filter>
     <!-- check flood-opacity and non-default values -->
     <filter id="dropShadow3">
-      <feDropShadow stdDeviation="2 5" dx="5" dy="5" flood-color="green" flood-opacity="0.5"/>
+      <feDropShadow stdDeviation="2 5" dx="5" dy="5" flood-color="green" flood-opacity="0.2"/>
     </filter>
     <!-- check sRGB -->
     <filter id="dropShadow4" color-interpolation-filters="sRGB">

layout/reftests/svg/filters/reftest.list

@@ -87,6 +87,8 @@ skip-if(B2G) == feDisplacementMap-scale-01.svg pass.svg
 
 skip-if(B2G) fuzzy-if(cocoaWidget,4,184) == feDistantLight-filterRes-01.svg feDistantLight-filterRes-01-ref.svg
 
+== feDropShadow-01.svg feDropShadow-01-ref.svg
+
 == feGaussianBlur-alpha-01.svg feGaussianBlur-alpha-01-ref.svg
 
 == feMorphology-radius-negative-01.svg pass.svg