Add SkColorSpacePrimaries to help with making D50 matrices

src/core/SkColorSpace.cpp

Index: src/core/SkColorSpace.cpp
diff --git a/src/core/SkColorSpace.cpp b/src/core/SkColorSpace.cpp
index e6676066bb24beac7ee8125478d1715921829fb9..54bee247a27bdf4961ca0eab3ecc88c271626b2c 100644
--- a/src/core/SkColorSpace.cpp
+++ b/src/core/SkColorSpace.cpp
@@ -132,6 +132,26 @@ sk_sp<SkColorSpace> SkColorSpace::NewRGB(RenderTargetGamma gamma, const SkMatrix
     }
 }
 
+sk_sp<SkColorSpace> SkColorSpace::NewRGB(const SkTransferFn& coeffs, const SkMatrix44& toXYZD50) {
+    // TODO: Check if coeffs match sRGB, 2.2, or linear.
+    // TODO: Make sure coefficients describe a valid curve.  Return nullptr if they don't.
+    void* memory = sk_malloc_throw(sizeof(SkGammas) + sizeof(SkTransferFn));
+    sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new (memory) SkGammas());
+    void* storage = SkTAddOffset<void>(memory, sizeof(SkGammas));
+     memcpy(storage, &coeffs, sizeof(SkTransferFn));
+     gammas->fRedType = SkGammas::Type::kParam_Type;
+     gammas->fGreenType = SkGammas::Type::kParam_Type;
+     gammas->fBlueType = SkGammas::Type::kParam_Type;
+
+     SkGammas::Data data;
+     data.fParamOffset = 0;
+     gammas->fRedData = data;
+     gammas->fGreenData = data;
+     gammas->fBlueData = data;
+     return sk_sp<SkColorSpace>(new SkColorSpace_Base(nullptr, kNonStandard_SkGammaNamed,
+                                                      std::move(gammas), toXYZD50, nullptr));
+}
+
 static SkColorSpace* gAdobeRGB;
 static SkColorSpace* gSRGB;
 
@@ -270,6 +290,8 @@ size_t SkColorSpace::writeToMemory(void* memory) const {
                 return sizeof(ColorSpaceHeader) + 12 * sizeof(float);
             }
             default:
+                // TODO: Fix this to serialize properly.
+
                 // Otherwise, write the gamma values and the matrix.
                 if (memory) {
                     *((ColorSpaceHeader*) memory) =
@@ -369,6 +391,8 @@ sk_sp<SkColorSpace> SkColorSpace::Deserialize(const void* data, size_t length) {
             return NewICC(data, profileSize);
         }
         case ColorSpaceHeader::kFloatGamma_Flag: {
+            // TODO: Fix this to deserialize properly.
+
             if (length < 15 * sizeof(float)) {
                 return nullptr;
             }