Refine the UseCounter for Document.charset

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 1146 matching lines @@
 
 String Document::defaultCharset() const
 {
     if (Settings* settings = this->settings())
         return settings->defaultTextEncodingName();
     return String();
 }
 
 void Document::setCharset(const String& charset)
 {
+    UseCounter::count(*this, UseCounter::DocumentSetCharset);
     if (DocumentLoader* documentLoader = loader())
         documentLoader->setUserChosenEncoding(charset);
     WTF::TextEncoding encoding(charset);
     // In case the encoding didn't exist, we keep the old one (helps some sites specifying invalid encodings).
     if (!encoding.isValid())
         return;
     DocumentEncodingData newEncodingData = m_encodingData;
     newEncodingData.setEncoding(encoding);
     setEncodingData(newEncodingData);
 }
@@ skipping 4582 matching lines @@
     visitor->trace(m_timeline);
     visitor->trace(m_compositorPendingAnimations);
     visitor->registerWeakMembers<Document, &Document::clearWeakMembers>(this);
     DocumentSupplementable::trace(visitor);
     TreeScope::trace(visitor);
     ContainerNode::trace(visitor);
     ExecutionContext::trace(visitor);
 }
 
 } // namespace WebCore