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

Source/platform/graphics/Color.cpp

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 #include "config.h"
 #include "platform/graphics/Color.h"
 
+#include "platform/graphics/ColorSpace.h"
 #include "wtf/Assertions.h"
 #include "wtf/DecimalNumber.h"
 #include "wtf/HexNumber.h"
 #include "wtf/MathExtras.h"
 #include "wtf/text/StringBuilder.h"
 
 using namespace std;
 
 namespace WebCore {
 
@@ skipping 286 matching lines @@
                  static_cast<int>(multiplier * g * scaleFactor),
                  static_cast<int>(multiplier * b * scaleFactor),
                  alpha());
 }
 
 Color Color::combineWithAlpha(float otherAlpha) const
 {
     return colorWithOverrideAlpha(rgb(), (alpha() / 255.f) * otherAlpha);
 }
 
+Color Color::convertToLinear() const
+{
+    const Vector<uint8_t>& lookUpTable = getLinearRgbLUT();
+    return Color(lookUpTable[red()], lookUpTable[green()], lookUpTable[blue()], alpha());
+}
+
 static int blendComponent(int c, int a)
 {
     // We use white.
     float alpha = a / 255.0f;
     int whiteBlend = 255 - a;
     c -= whiteBlend;
     return static_cast<int>(c / alpha);
 }
 
 const int cStartAlpha = 153; // 60%
@@ skipping 113 matching lines @@
             (color.green() * alpha  + 254) / 255,
             (color.blue() * alpha  + 254) / 255,
             alpha).rgb();
     } else
          pixelColor = color.rgb();
 
     return pixelColor;
 }
 
 } // namespace WebCore