Initial implementation of a SkColorSpace_A2B xform

src/core/SkColorSpace_Base.h

Index: src/core/SkColorSpace_Base.h
diff --git a/src/core/SkColorSpace_Base.h b/src/core/SkColorSpace_Base.h
index 3dbf351c72092c97e4e0a17cd385525af9695af3..480febd7ff999120d18b84f59df1335b5664dd28 100644
--- a/src/core/SkColorSpace_Base.h
+++ b/src/core/SkColorSpace_Base.h
@@ -8,6 +8,7 @@
 #ifndef SkColorSpace_Base_DEFINED
 #define SkColorSpace_Base_DEFINED
 
+#include "SkColorLookUpTable.h"
 #include "SkColorSpace.h"
 #include "SkData.h"
 #include "SkOnce.h"
@@ -143,30 +144,6 @@ struct SkGammas : SkRefCnt {
     void operator delete(void* p) { sk_free(p); }
 };
 
-struct SkColorLookUpTable : public SkRefCnt {
-    static constexpr uint8_t kOutputChannels = 3;
-
-    uint8_t                  fInputChannels;
-    uint8_t                  fGridPoints[3];
-
-    const float* table() const {
-        return SkTAddOffset<const float>(this, sizeof(SkColorLookUpTable));
-    }
-
-    SkColorLookUpTable(uint8_t inputChannels, uint8_t gridPoints[3])
-        : fInputChannels(inputChannels)
-    {
-        SkASSERT(3 == inputChannels);
-        memcpy(fGridPoints, gridPoints, 3 * sizeof(uint8_t));
-    }
-
-    // Objects of this type are created in a custom fashion using sk_malloc_throw
-    // and therefore must be sk_freed.
-    void* operator new(size_t size) = delete;
-    void* operator new(size_t, void* p) { return p; }
-    void operator delete(void* p) { sk_free(p); }
-};
-
 class SkColorSpace_Base : public SkColorSpace {
 public: