Refactor how we store and use samplers in Ganesh

src/effects/gradients/SkGradientShader.cpp

Index: src/effects/gradients/SkGradientShader.cpp
diff --git a/src/effects/gradients/SkGradientShader.cpp b/src/effects/gradients/SkGradientShader.cpp
index 6c141dcf80924ce4d2297947d33d9b8d1390ce29..b9ea4be4ec6970c942eb40ecff7be1c145110080 100644
--- a/src/effects/gradients/SkGradientShader.cpp
+++ b/src/effects/gradients/SkGradientShader.cpp
@@ -1031,7 +1031,7 @@ void GrGLGradientEffect::emitColor(GrGLSLFPFragmentBuilder* fragBuilder,
                                    const char* gradientTValue,
                                    const char* outputColor,
                                    const char* inputColor,
-                                   const SamplerArray& texSamplers) {
+                                   const SamplerHandle* texSampler) {
     if (SkGradientShaderBase::kTwo_GpuColorType == ge.getColorType()){
         fragBuilder->codeAppendf("\tvec4 colorTemp = mix(%s, %s, clamp(%s, 0.0, 1.0));\n",
                                  uniformHandler->getUniformVariable(fColorStartUni).c_str(),
@@ -1079,7 +1079,7 @@ void GrGLGradientEffect::emitColor(GrGLSLFPFragmentBuilder* fragBuilder,
                                  uniformHandler->getUniformVariable(fFSYUni).c_str());
         fragBuilder->codeAppendf("\t%s = ", outputColor);
         fragBuilder->appendTextureLookupAndModulate(inputColor,
-                                                    texSamplers[0],
+                                                    uniformHandler->getSampler(texSampler[0]),
                                                     "coord");
         fragBuilder->codeAppend(";\n");
     }