Introduce use counters for Blink specific editing event usage

Source/core/editing/Editor.h

 /*
  * Copyright (C) 2006, 2007, 2008 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 79 matching lines @@
     bool canPaste() const;
     bool canDelete() const;
     bool canSmartCopyOrDelete() const;
 
     void cut();
     void copy();
     void paste();
     void pasteAsPlainText();
     void performDelete();
 
+    static void countEvent(ExecutionContext*, const Event*);
     void copyImage(const HitTestResult&);
 
     void indent();
     void outdent();
     void transpose();
 
     bool shouldDeleteRange(Range*) const;
 
     void respondToChangedContents(const VisibleSelection& endingSelection);
 
@@ skipping 184 matching lines @@
 
 inline bool Editor::markedTextMatchesAreHighlighted() const
 {
     return m_areMarkedTextMatchesHighlighted;
 }
 
 
 } // namespace WebCore
 
 #endif // Editor_h