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

src/effects/gradients/SkGradientShaderPriv.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGradientShaderPriv_DEFINED
 #define SkGradientShaderPriv_DEFINED
 
@@ skipping 66 matching lines @@
 
 class SkGradientShaderBase : public SkShader {
 public:
     struct Descriptor {
         Descriptor() {
             sk_bzero(this, sizeof(*this));
             fTileMode = SkShader::kClamp_TileMode;
         }
 
         const SkMatrix*     fLocalMatrix;
-        const SkColor*      fColors;
-        const SkColor4f*    fColors4f;
+        const SkColor4f*    fColors;
         sk_sp<SkColorSpace> fColorSpace;
         const SkScalar*     fPos;
         int                 fCount;
         SkShader::TileMode  fTileMode;
         uint32_t            fGradFlags;
 
         void flatten(SkWriteBuffer&) const;
     };
 
     class DescriptorScope : public Descriptor {
     public:
         DescriptorScope() {}
 
         bool unflatten(SkReadBuffer&);
 
         // fColors and fPos always point into local memory, so they can be safely mutated
         //
-        SkColor* mutableColors() { return const_cast<SkColor*>(fColors); }
+        SkColor4f* mutableColors() { return const_cast<SkColor4f*>(fColors); }
         SkScalar* mutablePos() { return const_cast<SkScalar*>(fPos); }
 
     private:
         enum {
             kStorageCount = 16
         };
-        SkColor fColorStorage[kStorageCount];
+        SkColor4f fColorStorage[kStorageCount];
         SkScalar fPosStorage[kStorageCount];
         SkMatrix fLocalMatrixStorage;
         SkAutoMalloc fDynamicStorage;
     };
 
 public:
     SkGradientShaderBase(const Descriptor& desc, const SkMatrix& ptsToUnit);
     virtual ~SkGradientShaderBase();
 
     // The cache is initialized on-demand when getCache32 is called.
@@ skipping 376 matching lines @@
     GrGLSLProgramDataManager::UniformHandle fColorsUni;
     GrGLSLProgramDataManager::UniformHandle fFSYUni;
     GrGLSLProgramDataManager::UniformHandle fColorSpaceXformUni;
 
     typedef GrGLSLFragmentProcessor INHERITED;
 };
 
 #endif
 
 #endif