Web Animations: Add SVGNumberInterpolationType

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

Index: third_party/WebKit/Source/core/svg/properties/SVGPropertyHelper.h
diff --git a/third_party/WebKit/Source/core/svg/properties/SVGPropertyHelper.h b/third_party/WebKit/Source/core/svg/properties/SVGPropertyHelper.h
index aa1b1e5f5f6d3a3c732d1b9a4150d26ceb6a1034..fdfae73242c0f32fa284e706f2c5314f50c5c74f 100644
--- a/third_party/WebKit/Source/core/svg/properties/SVGPropertyHelper.h
+++ b/third_party/WebKit/Source/core/svg/properties/SVGPropertyHelper.h
@@ -26,6 +26,16 @@ public:
     }
 };
 
+#define DEFINE_SVG_PROPERTY_TYPE_CASTS(thisType)\
+    DEFINE_TYPE_CASTS(thisType, SVGPropertyBase, value, value->type() == thisType::classType(), value.type() == thisType::classType());\
+    inline PassRefPtrWillBeRawPtr<thisType> to##thisType(PassRefPtrWillBeRawPtr<SVGPropertyBase> passBase)\
+    {\
+        RefPtrWillBeRawPtr<SVGPropertyBase> base = passBase;\
+        ASSERT(base->type() == thisType::classType());\
+        return static_pointer_cast<thisType>(base.release());\
+    }
+
+
 } // namespace blink
 
 #endif // SVGPropertyHelper_h