Simplify color space xform storage and usage (float[] vs. SkMatrix44)

src/gpu/GrColorSpaceXform.cpp

Index: src/gpu/GrColorSpaceXform.cpp
diff --git a/src/gpu/GrColorSpaceXform.cpp b/src/gpu/GrColorSpaceXform.cpp
index f60dbcd1c02a7cfbaf64887f7000b8b75332a605..a1e89380482707cc24ac517c8024eb4c21cbcc2e 100644
--- a/src/gpu/GrColorSpaceXform.cpp
+++ b/src/gpu/GrColorSpaceXform.cpp
@@ -7,6 +7,7 @@
 
 #include "GrColorSpaceXform.h"
 #include "SkColorSpace.h"
+#include "SkMatrix44.h"
 
 static inline bool sk_float_almost_equals(float x, float y, float tol) {
     return sk_float_abs(x - y) <= tol;
@@ -33,6 +34,10 @@ static inline bool matrix_is_almost_identity(const SkMatrix44& m,
         sk_float_almost_equals(m.getFloat(3, 3), 1.0f, tol);
 }
 
+GrColorSpaceXform::GrColorSpaceXform(const SkMatrix44& srcToDst) {
+    srcToDst.asColMajorf(fSrcToDst);
+}
+
 sk_sp<GrColorSpaceXform> GrColorSpaceXform::Make(SkColorSpace* src, SkColorSpace* dst) {
     if (!src || !dst) {
         // Invalid