Initial implementation of a SkColorSpace_A2B xform

src/core/SkColorSpace_A2B.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkColorSpace_A2B_DEFINED
 #define SkColorSpace_A2B_DEFINED
 
@@ skipping 114 matching lines @@
 
     private:
         Type                      fType;
         SkGammaNamed              fGammaNamed;
         sk_sp<SkGammas>           fGammas;
         sk_sp<SkColorLookUpTable> fCLUT;
         SkMatrix44                fMatrix;
     };
     const Element& element(size_t i) const { return fElements[i]; }
     
-    size_t count() const { return fElements.size(); }
+    int count() const { return (int)fElements.size(); }
 
     // the intermediate profile connection space that this color space
     // represents the transformation to
     enum class PCS : uint8_t {
         kLAB, // CIELAB
         kXYZ  // CIEXYZ
     };
     
     PCS pcs() const { return fPCS; }
 
 private:
     SkColorSpace_A2B(PCS pcs, sk_sp<SkData> profileData, std::vector<Element> elements);
 
     PCS                  fPCS;
     std::vector<Element> fElements;
 
     friend class SkColorSpace;
+    friend class ColorSpaceXformTest;
     typedef SkColorSpace_Base INHERITED;
 };
 
 #endif