Gradients are serialized (and can be constructed) as SkColor4f + SkColorSpace

src/effects/gradients/SkRadialGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRadialGradient.h"
 #include "SkNx.h"
 
@@ skipping 49 matching lines @@
     return kRadial_GradientType;
 }
 
 sk_sp<SkFlattenable> SkRadialGradient::CreateProc(SkReadBuffer& buffer) {
     DescriptorScope desc;
     if (!desc.unflatten(buffer)) {
         return nullptr;
     }
     const SkPoint center = buffer.readPoint();
     const SkScalar radius = buffer.readScalar();
-    return SkGradientShader::MakeRadial(center, radius, desc.fColors, desc.fPos, desc.fCount,
-                                        desc.fTileMode, desc.fGradFlags, desc.fLocalMatrix);
+    return SkGradientShader::MakeRadial(center, radius, desc.fColors, std::move(desc.fColorSpace),
+                                        desc.fPos, desc.fCount, desc.fTileMode, desc.fGradFlags,
+                                        desc.fLocalMatrix);
 }
 
 void SkRadialGradient::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writePoint(fCenter);
     buffer.writeScalar(fRadius);
 }
 
 namespace {
 
@@ skipping 293 matching lines @@
     str->appendScalar(fCenter.fY);
     str->append(") radius: ");
     str->appendScalar(fRadius);
     str->append(" ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif