Centralize TextStream functions to remove RenderTreeAsText dependency of the filters

Source/core/platform/graphics/filters/FEColorMatrix.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) 2009 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/platform/graphics/filters/FEColorMatrix.h"
 
 #include "core/platform/graphics/GraphicsContext.h"
 #include "core/platform/graphics/filters/Filter.h"
 #include "core/platform/graphics/filters/SkiaImageFilterBuilder.h"
 #include "core/platform/graphics/skia/NativeImageSkia.h"
-#include "core/rendering/RenderTreeAsText.h"
 #include "platform/text/TextStream.h"
 #include "wtf/MathExtras.h"
 #include "wtf/Uint8ClampedArray.h"
 
 #include "SkColorFilterImageFilter.h"
 #include "SkColorMatrixFilter.h"
 
 namespace WebCore {
 
 FEColorMatrix::FEColorMatrix(Filter* filter, ColorMatrixType type, const Vector<float>& values)
@@ skipping 284 matching lines @@
                 ts << " ";
         }
         ts << "\"";
     }
     ts << "]\n";
     inputEffect(0)->externalRepresentation(ts, indent + 1);
     return ts;
 }
 
 } // namespace WebCore