Prepare SkColorSpace to be a public API

gm/color4f.cpp

 /*
  * Copyright 2011 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 "SkCanvas.h"
 #include "SkColorPriv.h"
@@ skipping 77 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 #include "SkColorSpace.h"
 
 DEF_SIMPLE_GM(color4shader, canvas, 1024, 260) {
     canvas->translate(10, 10);
 
     SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
     // red -> blue, green -> red, blue -> green
     mat.set3x3(0, 1, 0, 0, 0, 1, 1, 0, 0);
 
+    float linearGamma[3] = { 1.0f, 1.0f, 1.0f };
+
     const SkColor4f colors[] {
         { 1, 1, 0, 0 },
         { 1, 0, 1, 0 },
         { 1, 0, 0, 1 },
         { 1, 0.5, 0.5, 0.5 },
     };
 
     SkPaint paint;
     SkRect r = SkRect::MakeWH(100, 100);
 
     for (const auto& c4 : colors) {
         sk_sp<SkShader> shaders[] {
             SkShader::MakeColorShader(c4, nullptr),
             SkShader::MakeColorShader(c4, SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named)),
-            SkShader::MakeColorShader(c4, SkColorSpace::NewRGB(SkColorSpace::SkGammas(1, 1, 1),
-                                                               mat)),
+            SkShader::MakeColorShader(c4, SkColorSpace::NewRGB(linearGamma, mat)),
         };
 
         canvas->save();
         for (const auto& s : shaders) {
             paint.setShader(s);
             canvas->drawRect(r, paint);
             canvas->translate(r.width() * 6 / 5, 0);
         }
         canvas->restore();
         canvas->translate(0, r.height() * 6 / 5);
     }
 }