Introduce use counters for Blink specific CSS classes for editing

Source/core/editing/htmlediting.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 26 matching lines @@
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/Editor.h"
 #include "core/editing/HTMLInterchange.h"
 #include "core/editing/PlainTextRange.h"
 #include "core/editing/TextIterator.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleSelection.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLLIElement.h"
 #include "core/html/HTMLOListElement.h"
 #include "core/html/HTMLParagraphElement.h"
 #include "core/html/HTMLTableCellElement.h"
 #include "core/html/HTMLUListElement.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/RenderTableCell.h"
 #include "wtf/Assertions.h"
@@ skipping 760 matching lines @@
     return createHTMLElement(document, name.localName());
 }
 
 PassRefPtrWillBeRawPtr<HTMLElement> createHTMLElement(Document& document, const AtomicString& tagName)
 {
     return HTMLElementFactory::createHTMLElement(tagName, document, 0, false);
 }
 
 bool isTabSpanNode(const Node* node)
 {
-    return isHTMLSpanElement(node) && toElement(node)->getAttribute(classAttr) == AppleTabSpanClass;
+    if (!isHTMLSpanElement(node) || toElement(node)->getAttribute(classAttr) != AppleTabSpanClass)
+        return false;
+    UseCounter::count(node->document(), UseCounter::EditingAppleTabSpanClass);
+    return true;
 }
 
 bool isTabSpanTextNode(const Node* node)
 {
     return node && node->isTextNode() && node->parentNode() && isTabSpanNode(node->parentNode());
 }
 
 Node* tabSpanNode(const Node* node)
 {
     return isTabSpanTextNode(node) ? node->parentNode() : 0;
@@ skipping 275 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return visiblePosition.next().deepEquivalent().downstream();
 
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return visiblePosition.deepEquivalent().downstream();
 }
 
 } // namespace WebCore