Refactor how we store and use samplers in Ganesh

src/gpu/gl/GrGLProgramDataManager.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 GrGLProgramDataManager_DEFINED
 #define GrGLProgramDataManager_DEFINED
 
@@ skipping 28 matching lines @@
 
     // This uses an allocator rather than array so that the GrGLSLShaderVars don't move in memory
     // after they are inserted. Users of GrGLShaderBuilder get refs to the vars and ptrs to their
     // name strings. Otherwise, we'd have to hand out copies.
     typedef GrTAllocator<UniformInfo> UniformInfoArray;
     typedef GrTAllocator<VaryingInfo> VaryingInfoArray;
 
     GrGLProgramDataManager(GrGLGpu*, GrGLuint programID, const UniformInfoArray&,
                            const VaryingInfoArray&);
 
+
+    void setSamplers(const SkTArray<GrGLSampler>& samplers) const;
+
     /** Functions for uploading uniform values. The varities ending in v can be used to upload to an
-     *  array of uniforms. arrayCount must be <= the array count of the uniform.
-     */
-    void setSampler(UniformHandle, int texUnit) const;
-
+    *  array of uniforms. arrayCount must be <= the array count of the uniform.
+    */
     void set1f(UniformHandle, float v0) const override;
     void set1fv(UniformHandle, int arrayCount, const float v[]) const override;
     void set2f(UniformHandle, float, float) const override;
     void set2fv(UniformHandle, int arrayCount, const float v[]) const override;
     void set3f(UniformHandle, float, float, float) const override;
     void set3fv(UniformHandle, int arrayCount, const float v[]) const override;
     void set4f(UniformHandle, float, float, float, float) const override;
     void set4fv(UniformHandle, int arrayCount, const float v[]) const override;
     // matrices are column-major, the first three upload a single matrix, the latter three upload
     // arrayCount matrices into a uniform array.
@@ skipping 40 matching lines @@
 
     SkTArray<Uniform, true> fUniforms;
     SkTArray<PathProcVarying, true> fPathProcVaryings;
     GrGLGpu* fGpu;
     GrGLuint fProgramID;
 
     typedef GrGLSLProgramDataManager INHERITED;
 };
 
 #endif