Refactor how we store and use samplers in Ganesh

src/gpu/gl/GrGLUniformHandler.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLUniformHandler_DEFINED
 #define GrGLUniformHandler_DEFINED
 
 #include "glsl/GrGLSLUniformHandler.h"
 
 #include "gl/GrGLProgramDataManager.h"
+#include "gl/GrGLSampler.h"
 
 class GrGLCaps;
 
 class GrGLUniformHandler : public GrGLSLUniformHandler {
 public:
     static const int kUniformsPerBlock = 8;
 
     const GrGLSLShaderVar& getUniformVariable(UniformHandle u) const override {
         return fUniforms[u.toIndex()].fVariable;
     }
 
     const char* getUniformCStr(UniformHandle u) const override {
         return this->getUniformVariable(u).c_str();
     }
 private:
     explicit GrGLUniformHandler(GrGLSLProgramBuilder* program)
         : INHERITED(program)
         , fUniforms(kUniformsPerBlock) {}
 
     UniformHandle internalAddUniformArray(uint32_t visibility,
                                           GrSLType type,
                                           GrSLPrecision precision,
                                           const char* name,
                                           bool mangleName,
                                           int arrayCount,
                                           const char** outName) override;
 
+    SamplerHandle internalAddSampler(uint32_t visibility,
+                                     GrPixelConfig config,
+                                     GrSLType type,
+                                     GrSLPrecision precision,
+                                     const char* name) override;
+
+    int numSamplers() const override { return fSamplers.count(); }
+    const GrGLSLSampler& getSampler(SamplerHandle handle) const override {
+        return fSamplers[handle.toIndex()];
+    }
+
     void appendUniformDecls(GrShaderFlags visibility, SkString*) const override;
 
     // Manually set uniform locations for all our uniforms.
     void bindUniformLocations(GrGLuint programID, const GrGLCaps& caps);
 
     // Updates the loction of the Uniforms if we cannot bind uniform locations manually
     void getUniformLocations(GrGLuint programID, const GrGLCaps& caps);
 
     const GrGLGpu* glGpu() const;
 
     typedef GrGLProgramDataManager::UniformInfo UniformInfo;
     typedef GrGLProgramDataManager::UniformInfoArray UniformInfoArray;
 
     UniformInfoArray fUniforms;
 
+    SkTArray<GrGLSampler> fSamplers;
+
     friend class GrGLProgramBuilder;
 
     typedef GrGLSLUniformHandler INHERITED;
 };
 
 #endif