Refactor how we store and use samplers in Ganesh

src/gpu/effects/GrSimpleTextureEffect.cpp

Index: src/gpu/effects/GrSimpleTextureEffect.cpp
diff --git a/src/gpu/effects/GrSimpleTextureEffect.cpp b/src/gpu/effects/GrSimpleTextureEffect.cpp
index f4cbd06af9d474298554201859b1b04f44878654..0af9cddcc3ba845ecf49c66e340680937076016a 100644
--- a/src/gpu/effects/GrSimpleTextureEffect.cpp
+++ b/src/gpu/effects/GrSimpleTextureEffect.cpp
@@ -10,16 +10,18 @@
 #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(";");
     }