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

Source/platform/graphics/filters/FilterEffect.h

Index: Source/platform/graphics/filters/FilterEffect.h
diff --git a/Source/platform/graphics/filters/FilterEffect.h b/Source/platform/graphics/filters/FilterEffect.h
index e582fc0895729234ac37a5c7710229671235a3d8..8e4c351797b89e23242f9b4739f65183519eb87e 100644
--- a/Source/platform/graphics/filters/FilterEffect.h
+++ b/Source/platform/graphics/filters/FilterEffect.h
@@ -26,6 +26,7 @@
 #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"
@@ -183,6 +184,8 @@ protected:
     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; }