Centralize TextStream functions to remove RenderTreeAsText dependency of the filters

Source/core/svg/graphics/filters/SVGFEImage.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2010 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2013 Google 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
@@ skipping 11 matching lines @@
  */
 
 #include "config.h"
 
 #include "core/svg/graphics/filters/SVGFEImage.h"
 
 #include "SkBitmapSource.h"
 #include "core/platform/graphics/GraphicsContext.h"
 #include "core/platform/graphics/filters/Filter.h"
 #include "core/rendering/RenderObject.h"
-#include "core/rendering/RenderTreeAsText.h"
 #include "core/rendering/svg/SVGRenderingContext.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/SVGPreserveAspectRatio.h"
 #include "core/svg/SVGURIReference.h"
 #include "platform/text/TextStream.h"
 #include "platform/transforms/AffineTransform.h"
 
 namespace WebCore {
 
 FEImage::FEImage(Filter* filter, PassRefPtr<Image> image, const SVGPreserveAspectRatio& preserveAspectRatio)
@@ skipping 119 matching lines @@
     if (!m_image)
         return 0;
 
     if (!m_image->nativeImageForCurrentFrame())
         return 0;
 
     return adoptRef(new SkBitmapSource(m_image->nativeImageForCurrentFrame()->bitmap()));
 }
 
 } // namespace WebCore