Add use counters for SVGCursorElement

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/svg/SVGCursorElement.h"
 
 #include "core/SVGNames.h"
 #include "core/dom/StyleChangeReason.h"
+#include "core/frame/UseCounter.h"
 
 namespace blink {
 
 inline SVGCursorElement::SVGCursorElement(Document& document)
     : SVGElement(SVGNames::cursorTag, document)
     , SVGTests(this)
     , SVGURIReference(this)
     , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(SVGLengthMode::Width)))
     , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(SVGLengthMode::Height)))
 {
     addToPropertyMap(m_x);
     addToPropertyMap(m_y);
+
+    UseCounter::count(document, UseCounter::SVGCursorElement);
 }
 
 DEFINE_NODE_FACTORY(SVGCursorElement)
 
 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);
 }
 
 void SVGCursorElement::removeReferencedElement(SVGElement* element)
 {
     m_clients.remove(element);
 }
 
 void SVGCursorElement::svgAttributeChanged(const QualifiedName& attrName)
@@ skipping 17 matching lines @@
 {
     visitor->trace(m_x);
     visitor->trace(m_y);
     visitor->trace(m_clients);
     SVGElement::trace(visitor);
     SVGTests::trace(visitor);
     SVGURIReference::trace(visitor);
 }
 
 } // namespace blink