Create a single, unique pointer to sRGB color space

src/core/SkColorSpace.h

Index: src/core/SkColorSpace.h
diff --git a/src/core/SkColorSpace.h b/src/core/SkColorSpace.h
index 6498941d7dcb795e08587d159e087df4d7e38ca7..fe89ff5fb184d1c80b2487014aba9442ec40fee4 100644
--- a/src/core/SkColorSpace.h
+++ b/src/core/SkColorSpace.h
@@ -115,7 +115,7 @@ public:
      *  Return a colorspace instance, given a transform from linear_RGB to D50_XYZ
      *  and the src-gamma, return a ColorSpace
      */
-    static sk_sp<SkColorSpace> NewRGB(const SkMatrix44& toXYZD50, SkGammas gammas);
+    static sk_sp<SkColorSpace> NewRGB(SkGammas gammas, const SkMatrix44& toXYZD50);
 
     static sk_sp<SkColorSpace> NewNamed(Named);
     static sk_sp<SkColorSpace> NewICC(const void*, size_t);