Revert of Refactor how we store and use samplers in Ganesh

src/gpu/vk/GrVkGLSLSampler.h

-/*
-* Copyright 2016 Google Inc.
-*
-* Use of this source code is governed by a BSD-style license that can be
-* found in the LICENSE file.
-*/
-
-#ifndef GrVkGLSLSampler_DEFINED
-#define GrVkGLSLSampler_DEFINED
-
-#include "glsl/GrGLSLSampler.h"
-
-#include "glsl/GrGLSLShaderVar.h"
-
-class GrVkGLSLSampler : public GrGLSLSampler {
-public:
-    GrVkGLSLSampler(uint32_t visibility,
-                    GrPixelConfig config,
-                    GrSLType type,
-                    GrSLPrecision precision,
-                    const char* name,
-                    uint32_t binding,
-                    uint32_t set) : INHERITED(visibility, config), fBinding(binding) {
-        SkASSERT(GrSLTypeIsSamplerType(type));
-        fShaderVar.setType(type);
-        fShaderVar.setTypeModifier(GrGLSLShaderVar::kUniform_TypeModifier);
-        fShaderVar.setPrecision(precision);
-        fShaderVar.accessName()->set(name);
-        SkString layoutQualifier;
-        layoutQualifier.appendf("set=%d, binding=%d", set, binding);
-        fShaderVar.setLayoutQualifier(layoutQualifier.c_str());
-    }
-
-    GrSLType type() const override { return fShaderVar.getType(); }
-    uint32_t binding() const { return fBinding; }
-
-    const char* onGetSamplerNameForTexture2D() const override { return fShaderVar.c_str(); }
-    const char* getSamplerNameForTexelFetch() const override { return fShaderVar.c_str(); }
-
-private:
-    GrGLSLShaderVar fShaderVar;
-    uint32_t        fBinding;
-
-    friend class GrVkUniformHandler;
-
-    typedef GrGLSLSampler INHERITED;
-};
-
-#endif