Track the region where text is painted.

Source/core/rendering/RenderEmbeddedObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 172 matching lines @@
     
     GraphicsContextStateSaver stateSaver(*context);
     context->clip(contentRect);
     context->setAlpha(replacementTextRoundedRectOpacity);
     context->setFillColor(Color::white, style()->colorSpace());
     context->fillPath(path);
 
     const FontMetrics& fontMetrics = font.fontMetrics();
     float labelX = roundf(replacementTextRect.location().x() + (replacementTextRect.size().width() - textWidth) / 2);
     float labelY = roundf(replacementTextRect.location().y() + (replacementTextRect.size().height() - fontMetrics.height()) / 2 + fontMetrics.ascent());
+    TextRunPaintInfo runInfo(run);
+    runInfo.bounds = replacementTextRect;
     context->setAlpha(replacementTextTextOpacity);
     context->setFillColor(Color::black, style()->colorSpace());
-    context->drawBidiText(font, run, FloatPoint(labelX, labelY));
+    context->drawBidiText(font, runInfo, FloatPoint(labelX, labelY));
 }
 
 bool RenderEmbeddedObject::getReplacementTextGeometry(const LayoutPoint& accumulatedOffset, FloatRect& contentRect, Path& path, FloatRect& replacementTextRect, Font& font, TextRun& run, float& textWidth) const
 {
     contentRect = contentBoxRect();
     contentRect.moveBy(roundedIntPoint(accumulatedOffset));
     
     FontDescription fontDescription;
     RenderTheme::defaultTheme()->systemFont(CSSValueWebkitSmallControl, fontDescription);
     fontDescription.setWeight(FontWeightBold);
@@ skipping 102 matching lines @@
 {
     return false;
 }
 
 bool RenderEmbeddedObject::canHaveChildren() const
 {
     return false;
 }
 
 }