Add SkColorSpaceXform to the public API

gm/colorspacexform.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkColor.h"
 #include "SkColorSpaceXform.h"
@@ skipping 23 matching lines @@
 
         SkMatrix44 wideGamut(SkMatrix44::kUninitialized_Constructor);
         wideGamut.set3x3RowMajorf(kWideGamutRGB_toXYZD50);
 
         sk_sp<SkColorSpace> srcSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
         sk_sp<SkColorSpace> dstSpace =
                 SkColorSpace::NewRGB(SkColorSpace::kLinear_RenderTargetGamma, wideGamut);
         std::unique_ptr<SkColorSpaceXform> xform = SkColorSpaceXform::New(srcSpace.get(),
                                                                           dstSpace.get());
 
-        xform->apply(fWideGamutColors, colors, kNumColors,
-                     SkColorSpaceXform::kRGBA_F32_ColorFormat,
-                     SkColorSpaceXform::kBGRA_8888_ColorFormat, kOpaque_SkAlphaType);
+        xform->apply(SkColorSpaceXform::kRGBA_F32_ColorFormat, fWideGamutColors,
+                     SkColorSpaceXform::kBGRA_8888_ColorFormat, colors, kNumColors,
+                     kOpaque_SkAlphaType);
     }
 
     SkString onShortName() override {
         return SkString("colorspacexform");
     }
 
     SkISize onISize() override {
         return SkISize::Make(500, 200);
     }
 
@@ skipping 22 matching lines @@
 private:
     static constexpr int kNumColors = 10;
 
     SkColor4f fSRGBColors[kNumColors];
     SkColor4f fWideGamutColors[kNumColors];
 
     typedef skiagm::GM INHERITED;
 };
 
 DEF_GM(return new ColorSpaceXformGM;)