Revert of Create swizzle table inside of glsl caps

src/gpu/gl/GrGLGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 110 matching lines @@
 
     GrStencilAttachment* createStencilAttachmentForRenderTarget(const GrRenderTarget* rt,
                                                                 int width,
                                                                 int height) override;
 
     GrBackendObject createTestingOnlyBackendTexture(void* pixels, int w, int h,
                                                     GrPixelConfig config) const override;
     bool isTestingOnlyBackendTexture(GrBackendObject id) const override;
     void deleteTestingOnlyBackendTexture(GrBackendObject id) const override;
 
+    /** If texture swizzling is available using tex parameters then it is preferred over mangling
+        the generated shader code. This potentially allows greater reuse of cached shaders. */
+    static const GrGLenum* GetTexParamSwizzle(GrPixelConfig config, const GrGLCaps& caps);
+
+
 private:
     GrGLGpu(GrGLContext* ctx, GrContext* context);
 
     // GrGpu overrides
     void onResetContext(uint32_t resetBits) override;
 
     void xferBarrier(GrRenderTarget*, GrXferBarrierType) override;
 
     GrTexture* onCreateTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle lifeCycle,
                                const void* srcData, size_t rowBytes) override;
@@ skipping 380 matching lines @@
 
     // Mapping of pixel configs to known supported stencil formats to be used
     // when adding a stencil buffer to a framebuffer.
     int fPixelConfigToStencilIndex[kGrPixelConfigCnt];
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif