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

Source/platform/graphics/filters/FilterEffect.cpp

Index: Source/platform/graphics/filters/FilterEffect.cpp
diff --git a/Source/platform/graphics/filters/FilterEffect.cpp b/Source/platform/graphics/filters/FilterEffect.cpp
index d70f534081386d14850d5947da68be05971ef046..ce8f23f723481bd38b66d3446078b5c987ae6b66 100644
--- a/Source/platform/graphics/filters/FilterEffect.cpp
+++ b/Source/platform/graphics/filters/FilterEffect.cpp
@@ -458,6 +458,12 @@ Uint8ClampedArray* FilterEffect::createPremultipliedImageResult()
     return m_premultipliedImageResult.get();
 }
 
+Color FilterEffect::adaptColorToOperatingColorSpace(const Color& deviceColor)
+{
+    // |deviceColor| is assumed to be DeviceRGB.
+    return ColorSpaceUtilities::convertColor(deviceColor, operatingColorSpace());
+}
+
 void FilterEffect::transformResultColorSpace(ColorSpace dstColorSpace)
 {
     if (!hasResult() || dstColorSpace == m_resultColorSpace)