Introduce use counters for shadow DOM handling in plainText()

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2479 matching lines @@
 }
 
 String Element::innerText()
 {
     // We need to update layout, since plainText uses line boxes in the layout tree.
     document().updateLayoutIgnorePendingStylesheets();
 
     if (!layoutObject())
         return textContent(true);
 
-    return plainText(Position(this, Position::PositionIsBeforeChildren), Position(this, Position::PositionIsAfterChildren));
+    return plainText(Position(this, Position::PositionIsBeforeChildren), Position(this, Position::PositionIsAfterChildren), TextIteratorForInnerText);

[yoichio, 2015/07/02 06:28:39]

Why do't you call UseCounter::count here directly?

[yosin_UTC9, 2015/07/02 06:40:29]

I would like to count only if |plainText()| handles shadow DOM tree.

[yoichio, 2015/07/02 07:10:32]

Can't we check that here?

[yosin_UTC9, 2015/07/02 08:08:31]

Yes, we can. But, we need to traverse tree here. We don't want to traverse
twice, once for here and another is |plaintText()|.

 }
 
 String Element::outerText()
 {
     // Getting outerText is the same as getting innerText, only
     // setting is different. You would think this should get the plain
     // text for the outer range, but this is wrong, <br> for instance
     // would return different values for inner and outer text by such
     // a rule, but it doesn't in WinIE, and we want to match that.
     return innerText();
@@ skipping 918 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink