Gamut transformation of the paint color in Ganesh

include/gpu/GrColorSpaceXform.h

Index: include/gpu/GrColorSpaceXform.h
diff --git a/include/gpu/GrColorSpaceXform.h b/include/gpu/GrColorSpaceXform.h
index 38b5ccfc08fcd7739f229fb7870efd4ec08f1e76..2d2cc867a59ce30ddc2bce8d835136533f5bc67b 100644
--- a/include/gpu/GrColorSpaceXform.h
+++ b/include/gpu/GrColorSpaceXform.h
@@ -8,6 +8,7 @@
 #ifndef GrColorSpaceXform_DEFINED
 #define GrColorSpaceXform_DEFINED
 
+#include "GrColor.h"
 #include "SkMatrix44.h"
 #include "SkRefCnt.h"
 
@@ -33,6 +34,8 @@ public:
         return SkToBool(xform) ? 1 : 0;
     }
 
+    GrColor4f apply(const GrColor4f& srcColor);
+
 private:
     SkMatrix44 fSrcToDst;
 };