Add destination color space to AsFPArgs. Eliminates last XFORMTODO.

gm/constcolorprocessor.cpp

Index: gm/constcolorprocessor.cpp
diff --git a/gm/constcolorprocessor.cpp b/gm/constcolorprocessor.cpp
index 32d03a0c02563ba2fed9d5cf56db9e4e9a4f1f8b..3a5d73acf3d94802a5338385f0fcb859f5a66760 100644
--- a/gm/constcolorprocessor.cpp
+++ b/gm/constcolorprocessor.cpp
@@ -100,7 +100,8 @@ protected:
                         skPaint.setColor(kPaintColors[paintType]);
                     }
                     // SRGBTODO: No sRGB inputs allowed here?
-                    SkAssertResult(SkPaintToGrPaint(context, skPaint, viewMatrix, false, &grPaint));
+                    SkAssertResult(SkPaintToGrPaint(context, skPaint, viewMatrix, false, nullptr,
+                                                    &grPaint));
 
                     GrConstColorProcessor::InputMode mode = (GrConstColorProcessor::InputMode) m;
                     GrColor color = kColors[procColor];