Move createColorSpaceFilter from ImageBuffer to ColorSpaceUtilities

Source/platform/graphics/ColorSpace.h

Index: Source/platform/graphics/ColorSpace.h
diff --git a/Source/platform/graphics/ColorSpace.h b/Source/platform/graphics/ColorSpace.h
index d76828e000466e1ec0b0c3d64628087536a5e87c..85b0092c060e6473e62c843de201f11a4ead8727 100644
--- a/Source/platform/graphics/ColorSpace.h
+++ b/Source/platform/graphics/ColorSpace.h
@@ -28,6 +28,9 @@
 
 #include "platform/PlatformExport.h"
 #include "platform/graphics/Color.h"
+#include "wtf/PassRefPtr.h"
+
+class SkColorFilter;
 
 namespace blink {
 
@@ -49,6 +52,9 @@ const uint8_t* getConversionLUT(ColorSpace dstColorSpace, ColorSpace srcColorSpa
 // Convert a Color assumed to be in the |srcColorSpace| into the |dstColorSpace|.
 Color convertColor(const Color& srcColor, ColorSpace dstColorSpace, ColorSpace srcColorSpace = ColorSpaceDeviceRGB);
 
+// Create a color filter that will convert from |srcColorSpace| into |dstColorSpace|.
+PassRefPtr<SkColorFilter> createColorSpaceFilter(ColorSpace srcColorSpace, ColorSpace dstColorSpace);
+
 } // namespace ColorSpaceUtilities
 
 } // namespace blink