Add use counters for SVGCursorElement

third_party/WebKit/Source/core/svg/SVGCursorElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGCursorElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGCursorElement.cpp b/third_party/WebKit/Source/core/svg/SVGCursorElement.cpp
index 87116a0583f6d67e53182d650cf5c45bb81b8d8c..4cfa5c1d7bc55d7c7614953ed2e21158fb781786 100644
--- a/third_party/WebKit/Source/core/svg/SVGCursorElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGCursorElement.cpp
@@ -22,6 +22,7 @@
 
 #include "core/SVGNames.h"
 #include "core/dom/StyleChangeReason.h"
+#include "core/frame/UseCounter.h"
 
 namespace blink {
 
@@ -34,6 +35,8 @@ inline SVGCursorElement::SVGCursorElement(Document& document)
 {
     addToPropertyMap(m_x);
     addToPropertyMap(m_y);
+
+    UseCounter::count(document, UseCounter::SVGCursorElement);
 }
 
 DEFINE_NODE_FACTORY(SVGCursorElement)
@@ -44,6 +47,8 @@ SVGCursorElement::~SVGCursorElement()
 
 void SVGCursorElement::addClient(SVGElement* element)
 {
+    UseCounter::count(document(), UseCounter::SVGCursorElementHasClient);

[foolip, 2016/09/28 14:57:01]

If this is not reach, the whole element has no effect except for sitting in the
DOM?

[fs, 2016/09/28 15:03:01]

That is correct, yes. Technically we still don't know if it's actually used even
then, but we lose enough information to be unable to determine (count) that.

+
     m_clients.add(element);
     element->setCursorElement(this);
 }