Throw exception if querying SVGAnimationElement with unresolved interval

Source/core/svg/SVGAnimationElement.h

Index: Source/core/svg/SVGAnimationElement.h
diff --git a/Source/core/svg/SVGAnimationElement.h b/Source/core/svg/SVGAnimationElement.h
index 8b3053d54167940cafd5ec45122b38435c2f1d4b..9dcce6b37f5e04477c2dc711f1b9466a57e5ba1a 100644
--- a/Source/core/svg/SVGAnimationElement.h
+++ b/Source/core/svg/SVGAnimationElement.h
@@ -32,6 +32,8 @@
 
 namespace blink {
 
+class ExceptionState;
+
 enum AnimationMode {
     NoAnimation,
     FromToAnimation,
@@ -60,9 +62,9 @@ class SVGAnimationElement : public SVGSMILElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     // SVGAnimationElement
-    float getStartTime() const;
+    float getStartTime(ExceptionState&) const;
     float getCurrentTime() const;
-    float getSimpleDuration() const;
+    float getSimpleDuration(ExceptionState&) const;
 
     void beginElement();
     void beginElementAt(float offset);