Remove GrGLProcessor and create GrGLSLTextureSampler class.

src/gpu/glsl/GrGLSLTextureSampler.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 GrGLSLTextureSampler_DEFINED
+#define GrGLSLTextureSampler_DEFINED
+
+#include "GrShaderVar.h"
+#include "GrTextureAccess.h"
+#include "glsl/GrGLSLProgramDataManager.h"
+
+class GrGLSLTextureSampler {
+public:
+    typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;
+    typedef SkTArray<GrGLSLTextureSampler> TextureSamplerArray;
+
+    GrGLSLTextureSampler(UniformHandle uniform, const GrTextureAccess& access)
+        : fSamplerUniform(uniform)
+        , fConfigComponentMask(GrPixelConfigComponentMask(access.getTexture()->config())) {
+        SkASSERT(0 != fConfigComponentMask);
+        memcpy(fSwizzle, access.getSwizzle(), 5);
+    }
+
+    // bitfield of GrColorComponentFlags present in the texture's config.
+    uint32_t configComponentMask() const { return fConfigComponentMask; }
+    // this is .abcd
+    const char* swizzle() const { return fSwizzle; }
+
+private:
+    UniformHandle fSamplerUniform;
+    uint32_t      fConfigComponentMask;
+    char          fSwizzle[5];
+
+    friend class GrGLShaderBuilder;
+};
+
+#endif