Add SkColorSpacePrimaries to help with making D50 matrices

tests/ColorSpaceTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Resources.h"
 #include "SkCodec.h"
 #include "SkColorSpace.h"
@@ skipping 253 matching lines @@
     REPORTER_ASSERT(r, !SkColorSpace::Equals(srgb.get(), nullptr));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(adobe.get(), srgb.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), srgb.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(z32.get(), z30.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(upperLeft.get(), srgb.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(upperLeft.get(), upperRight.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), upperRight.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(upperRight.get(), adobe.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(rgb1.get(), rgb2.get()));
 }
+
+DEF_TEST(ColorSpace_Primaries, r) {
+    // sRGB primaries
+    SkColorSpacePrimaries primaries;
+    primaries.fRX = 0.64f;
+    primaries.fRY = 0.33f;
+    primaries.fGX = 0.30f;
+    primaries.fGY = 0.60f;
+    primaries.fBX = 0.15f;
+    primaries.fBY = 0.06f;
+    primaries.fWX = 0.3127f;
+    primaries.fWY = 0.3290f;
+
+    SkMatrix44 toXYZ(SkMatrix44::kUninitialized_Constructor);
+    bool result = primaries.toXYZD50(&toXYZ);
+    REPORTER_ASSERT(r, result);
+
+    sk_sp<SkColorSpace> space = SkColorSpace::NewRGB(SkColorSpace::kSRGB_RenderTargetGamma, toXYZ);
+    REPORTER_ASSERT(r, SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named) == space);
+}