Cache the inverse matrix on SkColorSpace. Rename xyz() to toXYZ().

include/core/SkColorSpace.h

Index: include/core/SkColorSpace.h
diff --git a/include/core/SkColorSpace.h b/include/core/SkColorSpace.h
index 045117552626b55373074c6fa3c94d3b02295c9e..4abcdfad6c3f72208a9d6a422c8abd5898357e77 100644
--- a/include/core/SkColorSpace.h
+++ b/include/core/SkColorSpace.h
@@ -66,7 +66,12 @@ public:
     /**
      *  Returns the matrix used to transform src gamut to XYZ D50.
      */
-    const SkMatrix44& xyz() const { return fToXYZD50; }
+    const SkMatrix44& toXYZD50() const { return fToXYZD50; }
+
+    /**
+     * DEPRECATED - use toXYZD50 instead
+     */
+    const SkMatrix44& xyz() const { return toXYZD50(); }

[msarett, 2016/09/08 15:35:21]

I think you can go ahead and remove this.  Trybot seems to show that no one is
using this.

 
     /**
      *  Returns true if the color space gamma is near enough to be approximated as sRGB.