Convert first letter into a pseudo element.

Source/core/rendering/RenderTreeAsText.cpp

 /*
  * Copyright (C) 2004, 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 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/rendering/RenderTreeAsText.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/StylePropertySet.h"
 #include "core/dom/Document.h"
+#include "core/dom/PseudoElement.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLElement.h"
 #include "core/page/PrintContext.h"
 #include "core/rendering/FlowThreadController.h"
 #include "core/rendering/InlineTextBox.h"
 #include "core/rendering/RenderBR.h"
 #include "core/rendering/RenderDetailsMarker.h"
 #include "core/rendering/RenderFileUploadControl.h"
@@ skipping 725 matching lines @@
     element->document().updateLayout();
 
     RenderObject* renderer = element->renderer();
     if (!renderer || !renderer->isListItem())
         return String();
 
     return toRenderListItem(renderer)->markerText();
 }
 
 } // namespace blink