Allow gradient optimization with perspective

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 270 matching lines @@
         passed to the gradient factory rather than the array.
     */
     static const int kMaxRandomGradientColors = 4;
     static int RandomGradientParams(SkRandom* r,
                                     SkColor colors[kMaxRandomGradientColors],
                                     SkScalar** stops,
                                     SkShader::TileMode* tm);
 
     virtual bool onIsEqual(const GrEffect& effect) const SK_OVERRIDE;
 
+    const GrCoordTransform& getCoordTransform() const { return fCoordTransform; }
+
 private:
     static const GrCoordSet kCoordSet = kLocal_GrCoordSet;
 
     enum {
         kMaxAnalyticColors = 3 // if more colors use texture
     };
 
     GrCoordTransform fCoordTransform;
     GrTextureAccess fTextureAccess;
     SkScalar fYCoord;
@@ skipping 77 matching lines @@
     GrGLUniformManager::UniformHandle fColorStartUni;
     GrGLUniformManager::UniformHandle fColorMidUni;
     GrGLUniformManager::UniformHandle fColorEndUni;
 
     typedef GrGLEffect INHERITED;
 };
 
 #endif
 
 #endif