Add UseCounter for draggable attribute

third_party/WebKit/Source/core/html/HTMLElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2008, 2013, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * 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
@@ skipping 246 matching lines @@
             addPropertyToPresentationAttributeStyle(style, CSSPropertyWebkitUserModify, CSSValueReadWritePlaintextOnly);
             addPropertyToPresentationAttributeStyle(style, CSSPropertyWordWrap, CSSValueBreakWord);
             addPropertyToPresentationAttributeStyle(style, CSSPropertyWebkitLineBreak, CSSValueAfterWhiteSpace);
             UseCounter::count(document(), UseCounter::ContentEditablePlainTextOnly);
         } else if (equalIgnoringCase(value, "false")) {
             addPropertyToPresentationAttributeStyle(style, CSSPropertyWebkitUserModify, CSSValueReadOnly);
         }
     } else if (name == hiddenAttr) {
         addPropertyToPresentationAttributeStyle(style, CSSPropertyDisplay, CSSValueNone);
     } else if (name == draggableAttr) {
+        UseCounter::count(document(), UseCounter::DraggableAttribute);
         if (equalIgnoringCase(value, "true")) {
             addPropertyToPresentationAttributeStyle(style, CSSPropertyWebkitUserDrag, CSSValueElement);
             addPropertyToPresentationAttributeStyle(style, CSSPropertyUserSelect, CSSValueNone);
         } else if (equalIgnoringCase(value, "false")) {
             addPropertyToPresentationAttributeStyle(style, CSSPropertyWebkitUserDrag, CSSValueNone);
         }
     } else if (name == dirAttr) {
         if (equalIgnoringCase(value, "auto")) {
             addPropertyToPresentationAttributeStyle(style, CSSPropertyUnicodeBidi, unicodeBidiAttributeForDirAuto(this));
         } else {
@@ skipping 870 matching lines @@
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(blink::HTMLElement*);
 
 void dumpInnerHTML(blink::HTMLElement* element)
 {
     printf("%s\n", element->innerHTML().ascii().data());
 }
 #endif