SVG Web Animations: Add SVGNumberOptionalNumberInterpolationType

third_party/WebKit/Source/core/svg/SVGNumberOptionalNumber.h

Index: third_party/WebKit/Source/core/svg/SVGNumberOptionalNumber.h
diff --git a/third_party/WebKit/Source/core/svg/SVGNumberOptionalNumber.h b/third_party/WebKit/Source/core/svg/SVGNumberOptionalNumber.h
index ae3c398c000dd4b297cf63976e954edfa31e8628..f4606f8c59570f6fca71604b9b2931422cc85b73 100644
--- a/third_party/WebKit/Source/core/svg/SVGNumberOptionalNumber.h
+++ b/third_party/WebKit/Source/core/svg/SVGNumberOptionalNumber.h
@@ -59,8 +59,8 @@ public:
 
     static AnimatedPropertyType classType() { return AnimatedNumberOptionalNumber; }
 
-    PassRefPtrWillBeRawPtr<SVGNumber> firstNumber() { return m_firstNumber; }
-    PassRefPtrWillBeRawPtr<SVGNumber> secondNumber() { return m_secondNumber; }
+    PassRefPtrWillBeRawPtr<SVGNumber> firstNumber() const { return m_firstNumber; }
+    PassRefPtrWillBeRawPtr<SVGNumber> secondNumber() const { return m_secondNumber; }
 
     DECLARE_VIRTUAL_TRACE();
 
@@ -78,6 +78,12 @@ inline PassRefPtrWillBeRawPtr<SVGNumberOptionalNumber> toSVGNumberOptionalNumber
     return static_pointer_cast<SVGNumberOptionalNumber>(base.release());
 }
 
+inline const SVGNumberOptionalNumber& toSVGNumberOptionalNumber(const SVGPropertyBase& base)
+{
+    ASSERT(base.type() == SVGNumberOptionalNumber::classType());
+    return static_cast<const SVGNumberOptionalNumber&>(base);
+}
+
 } // namespace blink
 
 #endif // SVGNumberOptionalNumber_h