Track the region where text is painted.

Source/core/rendering/RenderListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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. 
@@ skipping 416 matching lines @@
     r.move(itemOffsetForAlignment(textRun, itemStyle, itemFont, r));
 
     if (element->hasTagName(optgroupTag)) {
         FontDescription d = itemFont.fontDescription();
         d.setWeight(d.bolderWeight());
         itemFont = Font(d, itemFont.letterSpacing(), itemFont.wordSpacing());
         itemFont.update(document()->styleResolver()->fontSelector());
     }
 
     // Draw the item text
-    paintInfo.context->drawBidiText(itemFont, textRun, roundedIntPoint(r.location()));
+    TextRunPaintInfo textRunPaintInfo(textRun);
+    textRunPaintInfo.bounds = r;
+    paintInfo.context->drawBidiText(itemFont, textRunPaintInfo, roundedIntPoint(r.location()));
 }
 
 void RenderListBox::paintItemBackground(PaintInfo& paintInfo, const LayoutPoint& paintOffset, int listIndex)
 {
     const Vector<HTMLElement*>& listItems = selectElement()->listItems();
     HTMLElement* element = listItems[listIndex];
 
     Color backColor;
     if (element->hasTagName(optionTag) && toHTMLOptionElement(element)->selected()) {
         if (frame()->selection()->isFocusedAndActive() && document()->focusedNode() == node())
@@ skipping 437 matching lines @@
 
     if (m_vBar)
         m_vBar->styleChanged();
 
     // Force an update since we know the scrollbars have changed things.
     if (document()->hasAnnotatedRegions())
         document()->setAnnotatedRegionsDirty(true);
 }
 
 } // namespace WebCore