Consolidate FilterOperation and FilterEffect mapRect implementations

third_party/WebKit/Source/platform/graphics/filters/FEGaussianBlur.h

 /*
  * 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) 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 13 matching lines @@
 #define FEGaussianBlur_h
 
 #include "platform/graphics/filters/FilterEffect.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT FEGaussianBlur final : public FilterEffect {
  public:
   static FEGaussianBlur* create(Filter*, float, float);
 
-  static IntSize calculateKernelSize(const Filter*, const FloatPoint& std);
-  static IntSize calculateUnscaledKernelSize(const FloatPoint& std);
+  // Compute which destination area will be affected when applying a gaussian
+  // blur effect with |stdDeviation| to an area |rect|.
+  static FloatRect mapEffect(const FloatSize& stdDeviation, const FloatRect&);
 
   TextStream& externalRepresentation(TextStream&, int indention) const override;
 
  private:
   FEGaussianBlur(Filter*, float, float);
 
   FloatRect mapEffect(const FloatRect&) const override;
 
   sk_sp<SkImageFilter> createImageFilter() override;
 
   float m_stdX;
   float m_stdY;
 };
 
 }  // namespace blink
 
 #endif  // FEGaussianBlur_h