Implement multi-color-stops in linear gradients using Sk4f

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 241 matching lines @@
                                    SkColor* colorSrc, Rec* recSrc,
                                    int count);
 
 private:
     enum {
         kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space
 
         kStorageSize = kColorStorageCount * (sizeof(SkColor) + sizeof(SkScalar) + sizeof(Rec))
     };
     SkColor     fStorage[(kStorageSize + 3) >> 2];
+public:
     SkColor*    fOrigColors; // original colors, before modulation by paint in context.
     SkScalar*   fOrigPos;   // original positions
+
+    bool colorsAreOpaque() const { return fColorsAreOpaque; }
+
+private:
     bool        fColorsAreOpaque;
 
     GradientShaderCache* refCache(U8CPU alpha, bool dither) const;
     mutable SkMutex                           fCacheMutex;
     mutable SkAutoTUnref<GradientShaderCache> fCache;
 
     void initCommon();
 
     typedef SkShader INHERITED;
 };
@@ skipping 175 matching lines @@
     GrGLSLProgramDataManager::UniformHandle fColorStartUni;
     GrGLSLProgramDataManager::UniformHandle fColorMidUni;
     GrGLSLProgramDataManager::UniformHandle fColorEndUni;
 
     typedef GrGLFragmentProcessor INHERITED;
 };
 
 #endif
 
 #endif