Add use counter for UTF-16 as a Web-exposed encoding

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 4099 matching lines @@
         && m_titleElement->textContent().containsOnlyLatin1()) {
 
         CString originalBytes = m_titleElement->textContent().latin1();
         OwnPtr<TextCodec> codec = newTextCodec(newData.encoding());
         String correctlyDecodedTitle = codec->decode(originalBytes.data(), originalBytes.length(), true);
         m_titleElement->setTextContent(correctlyDecodedTitle);
     }
 
     m_encodingData = newData;
 
+    if (m_encodingData.encoding() == UTF16LittleEndianEncoding()
+        || m_encodingData.encoding() == UTF16BigEndianEncoding()) {
+        UseCounter::count(this, UseCounter::UTF16AsWebExposedEncoding);
+    }
+
     // FIXME: Should be removed as part of https://code.google.com/p/chromium/issues/detail?id=319643
     bool shouldUseVisualOrdering = m_encodingData.encoding().usesVisualOrdering();
     if (shouldUseVisualOrdering != m_visuallyOrdered) {
         m_visuallyOrdered = shouldUseVisualOrdering;
         // FIXME: How is possible to not have a renderer here?
         if (renderView())
             renderView()->style()->setRTLOrdering(m_visuallyOrdered ? VisualOrder : LogicalOrder);
         setNeedsStyleRecalc(SubtreeStyleChange);
     }
 }
@@ skipping 1315 matching lines @@
 void Document::defaultEventHandler(Event* event)
 {
     if (frame() && frame()->remotePlatformLayer()) {
         frame()->chromeClient().forwardInputEvent(this, event);
         return;
     }
     Node::defaultEventHandler(event);
 }
 
 } // namespace WebCore