Unprefix -webkit-filter and add a pixel test for it.

sky/engine/core/animation/css/CSSPropertyEquality.cpp

Index: sky/engine/core/animation/css/CSSPropertyEquality.cpp
diff --git a/sky/engine/core/animation/css/CSSPropertyEquality.cpp b/sky/engine/core/animation/css/CSSPropertyEquality.cpp
index 6caf64fd82e4d3178772c7d4260aeff26487e510..de4f7af07cf4e36ec1d5500714e736ddda80d829 100644
--- a/sky/engine/core/animation/css/CSSPropertyEquality.cpp
+++ b/sky/engine/core/animation/css/CSSPropertyEquality.cpp
@@ -109,6 +109,8 @@ bool CSSPropertyEquality::propertiesEqual(CSSPropertyID prop, const RenderStyle&
         return a.clip() == b.clip();
     case CSSPropertyColor:
         return a.color() == b.color();
+    case CSSPropertyFilter:
+        return a.filter() == b.filter();
     case CSSPropertyFlexBasis:
         return a.flexBasis() == b.flexBasis();
     case CSSPropertyFlexGrow:
@@ -194,8 +196,6 @@ bool CSSPropertyEquality::propertiesEqual(CSSPropertyID prop, const RenderStyle&
         return dataEquivalent(a.boxShadow(), b.boxShadow());
     case CSSPropertyWebkitClipPath:
         return dataEquivalent(a.clipPath(), b.clipPath());
-    case CSSPropertyWebkitFilter:
-        return a.filter() == b.filter();
     case CSSPropertyWebkitMaskBoxImageOutset:
         return a.maskBoxImageOutset() == b.maskBoxImageOutset();
     case CSSPropertyWebkitMaskBoxImageSlice: