Web Animations: Support animation of SVG number attributes

Source/core/animation/StringKeyframe.cpp

Index: Source/core/animation/StringKeyframe.cpp
diff --git a/Source/core/animation/StringKeyframe.cpp b/Source/core/animation/StringKeyframe.cpp
index 8853639df5123a36a2f3da7c3a2929da75e020ee..9c7226403b71446ea3aa4dbca02ea55a7119c526 100644
--- a/Source/core/animation/StringKeyframe.cpp
+++ b/Source/core/animation/StringKeyframe.cpp
@@ -21,6 +21,7 @@
 #include "core/animation/LengthStyleInterpolation.h"
 #include "core/animation/ListSVGInterpolation.h"
 #include "core/animation/ListStyleInterpolation.h"
+#include "core/animation/NumberSVGInterpolation.h"
 #include "core/animation/PointSVGInterpolation.h"
 #include "core/animation/SVGStrokeDasharrayStyleInterpolation.h"
 #include "core/animation/ShadowStyleInterpolation.h"
@@ -480,6 +481,11 @@ PassRefPtrWillBeRawPtr<Interpolation> createSVGInterpolation(SVGPropertyBase* fr
         if (AngleSVGInterpolation::canCreateFrom(fromValue) && AngleSVGInterpolation::canCreateFrom(toValue))
             return AngleSVGInterpolation::create(fromValue, toValue, attribute);
         break;
+    case AnimatedNumber:
+        return NumberSVGInterpolation::create(fromValue, toValue, attribute);
+    case AnimatedNumberList:
+        interpolation = ListSVGInterpolation<NumberSVGInterpolation>::maybeCreate(fromValue, toValue, attribute);
+        break;
     case AnimatedIntegerOptionalInteger:
         return IntegerOptionalIntegerSVGInterpolation::create(fromValue, toValue, attribute);
     case AnimatedPoints: