Add a usecounter for SMIL elements in the document

Source/core/svg/animation/SVGSMILElement.cpp

Index: Source/core/svg/animation/SVGSMILElement.cpp
diff --git a/Source/core/svg/animation/SVGSMILElement.cpp b/Source/core/svg/animation/SVGSMILElement.cpp
index c864e613caa6aa5d4b6d8f9e973e032047ce5816..aaa39d929f2665b29e14044bda8185c54b06e170 100644
--- a/Source/core/svg/animation/SVGSMILElement.cpp
+++ b/Source/core/svg/animation/SVGSMILElement.cpp
@@ -33,6 +33,7 @@
 #include "core/events/Event.h"
 #include "core/events/EventListener.h"
 #include "core/events/EventSender.h"
+#include "core/frame/UseCounter.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGSVGElement.h"
 #include "core/svg/SVGURIReference.h"
@@ -313,6 +314,8 @@ Node::InsertionNotificationRequest SVGSMILElement::insertedInto(ContainerNode* r
     if (!rootParent->inDocument())
         return InsertionDone;
 
+    UseCounter::count(document(), UseCounter::SVGSMILElementInDocument);
+
     setAttributeName(constructQualifiedName(this, fastGetAttribute(SVGNames::attributeNameAttr)));
     SVGSVGElement* owner = ownerSVGElement();
     if (!owner)