SVG Web Animations: Add SVGInterpolationType pipeline

third_party/WebKit/Source/core/svg/properties/SVGAnimatedProperty.h

Index: third_party/WebKit/Source/core/svg/properties/SVGAnimatedProperty.h
diff --git a/third_party/WebKit/Source/core/svg/properties/SVGAnimatedProperty.h b/third_party/WebKit/Source/core/svg/properties/SVGAnimatedProperty.h
index 00326e27106821512503e97f0f5969f89ad559f2..e6db19249b58c245a131141baf485dc56ae900fc 100644
--- a/third_party/WebKit/Source/core/svg/properties/SVGAnimatedProperty.h
+++ b/third_party/WebKit/Source/core/svg/properties/SVGAnimatedProperty.h
@@ -53,6 +53,7 @@ public:
     virtual ~SVGAnimatedPropertyBase();
 
     virtual SVGPropertyBase* currentValueBase() = 0;
+    virtual const SVGPropertyBase* currentValueBase() const = 0;
     virtual bool isAnimating() const = 0;
 
     virtual PassRefPtrWillBeRawPtr<SVGPropertyBase> createAnimatedValue() = 0;
@@ -132,6 +133,11 @@ public:
         return currentValue();
     }
 
+    const SVGPropertyBase* currentValueBase() const override
+    {
+        return currentValue();
+    }
+
     bool isAnimating() const override
     {
         return m_currentValue;