Split GrFragmentProcessor into its own header

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 280 matching lines @@
 
 static inline int next_dither_toggle16(int toggle) {
     return toggle ^ SkGradientShaderBase::kDitherStride16;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #if SK_SUPPORT_GPU
 
 #include "GrCoordTransform.h"
+#include "GrFragmentProcessor.h"
 #include "gl/GrGLProcessor.h"
 
 class GrFragmentStage;
 class GrBackendProcessorFactory;
 
 /*
  * The interpretation of the texture matrix depends on the sample mode. The
  * texture matrix is applied both when the texture coordinates are explicit
  * and  when vertex positions are used as texture  coordinates. In the latter
  * case the texture matrix is applied to the pre-view-matrix position
@@ skipping 155 matching lines @@
     GrGLProgramDataManager::UniformHandle fColorStartUni;
     GrGLProgramDataManager::UniformHandle fColorMidUni;
     GrGLProgramDataManager::UniformHandle fColorEndUni;
 
     typedef GrGLFragmentProcessor INHERITED;
 };
 
 #endif
 
 #endif