Refactor how we store and use samplers in Ganesh

src/gpu/effects/GrSimpleTextureEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrSimpleTextureEffect.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
+#include "glsl/GrGLSLUniformHandler.h"
 
 class GrGLSimpleTextureEffect : public GrGLSLFragmentProcessor {
 public:
     void emitCode(EmitArgs& args) override {
         GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
         fragBuilder->codeAppendf("%s = ", args.fOutputColor);
+        const GrGLSLSampler& sampler = args.fUniformHandler->getSampler(args.fTexSamplers[0]);
         fragBuilder->appendTextureLookupAndModulate(args.fInputColor,
-                                                  args.fTexSamplers[0],
-                                                  args.fCoords[0].c_str(),
-                                                  args.fCoords[0].getType());
+                                                    sampler,
+                                                    args.fCoords[0].c_str(),
+                                                    args.fCoords[0].getType());
         fragBuilder->codeAppend(";");
     }
 
 private:
     typedef GrGLSLFragmentProcessor INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrSimpleTextureEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
@@ skipping 30 matching lines @@
 
     static const GrCoordSet kCoordSets[] = {
         kLocal_GrCoordSet,
         kDevice_GrCoordSet
     };
     GrCoordSet coordSet = kCoordSets[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kCoordSets))];
 
     const SkMatrix& matrix = GrTest::TestMatrix(d->fRandom);
     return GrSimpleTextureEffect::Create(d->fTextures[texIdx], matrix, coordSet);
 }