Add support for converting Colors to linear RGB; Fix relevant filters

Source/platform/graphics/filters/FilterEffect.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef FilterEffect_h
 #define FilterEffect_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
+#include "platform/graphics/Color.h"
 #include "platform/graphics/ColorSpace.h"
 
 #include "third_party/skia/include/core/SkImageFilter.h"
 
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Uint8ClampedArray.h"
 #include "wtf/Vector.h"
 
@@ skipping 137 matching lines @@
     virtual FloatRect determineAbsolutePaintRect(const FloatRect& requestedAbsoluteRect);
     virtual bool affectsTransparentPixels() { return false; }
 
 protected:
     FilterEffect(Filter*);
 
     ImageBuffer* createImageBufferResult();
     Uint8ClampedArray* createUnmultipliedImageResult();
     Uint8ClampedArray* createPremultipliedImageResult();
 
+    Color adaptColorToOperatingColorSpace(const Color& deviceColor);
+
     // Return true if the filter will only operate correctly on valid RGBA values, with
     // alpha in [0,255] and each color component in [0, alpha].
     virtual bool requiresValidPreMultipliedPixels() { return true; }
 
     // If a pre-multiplied image, check every pixel for validity and correct if necessary.
     void forceValidPreMultipliedPixels();
     SkImageFilter::CropRect getCropRect(const FloatSize& cropOffset) const;
 
     void addAbsolutePaintRect(const FloatRect& absolutePaintRect);
 
@@ skipping 36 matching lines @@
     // Should the effect clip to its primitive region, or expand to use the combined region of its inputs.
     bool m_clipsToBounds;
 
     ColorSpace m_operatingColorSpace;
     ColorSpace m_resultColorSpace;
 };
 
 } // namespace WebCore
 
 #endif // FilterEffect_h