Implement the inert 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
@@ skipping 439 matching lines @@
 }
 
 void HTMLElement::parseAttribute(const AttributeModificationParams& params) {
   if (params.name == tabindexAttr || params.name == XMLNames::langAttr)
     return Element::parseAttribute(params);
 
   if (params.name == dirAttr) {
     dirAttributeChanged(params.newValue);
   } else if (params.name == langAttr) {
     pseudoStateChanged(CSSSelector::PseudoLang);
+  } else if (params.name == inertAttr) {
+    UseCounter::count(document(), UseCounter::InertAttribute);
   } else {
     const AtomicString& eventName = eventNameForAttributeName(params.name);
     if (!eventName.isNull()) {
       setAttributeEventListener(
           eventName,
           createAttributeEventListener(this, params.name, params.newValue,
                                        eventParameterName()));
     }
   }
 }
@@ skipping 745 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