Centralize TextStream functions to remove RenderTreeAsText dependency of the filters

Source/core/platform/graphics/filters/FEFlood.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 12 matching lines @@
 
 #include "config.h"
 
 #include "core/platform/graphics/filters/FEFlood.h"
 
 #include "SkFlattenableBuffers.h"
 #include "SkImageFilter.h"
 #include "core/platform/graphics/GraphicsContext.h"
 #include "core/platform/graphics/filters/Filter.h"
 #include "core/platform/graphics/filters/SkiaImageFilterBuilder.h"
-#include "core/rendering/RenderTreeAsText.h"
 #include "platform/text/TextStream.h"
 #include "third_party/skia/include/core/SkDevice.h"
 
 namespace {
 
 class FloodImageFilter : public SkImageFilter {
 public:
     FloodImageFilter(const SkColor& color, const CropRect* cropRect)
         : SkImageFilter(0, 0, cropRect)
         , m_color(color)
@@ skipping 103 matching lines @@
 {
     writeIndent(ts, indent);
     ts << "[feFlood";
     FilterEffect::externalRepresentation(ts);
     ts << " flood-color=\"" << floodColor().nameForRenderTreeAsText() << "\" "
        << "flood-opacity=\"" << floodOpacity() << "\"]\n";
     return ts;
 }
 
 } // namespace WebCore