Create swizzle table inside of glsl caps

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index 2ad58270753c0fd9322fab2d1043be282efdb1e5..e4ac7da6b055df3a319b437ab5c259227f99a2f4 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -273,6 +273,8 @@ private:
     void initGLSL(const GrGLContextInfo&);
     bool hasPathRenderingSupport(const GrGLContextInfo&, const GrGLInterface*);
 
+    void onApplyOptionsOverrides(const GrContextOptions& options) override;
+
     /**
      * Maintains a bit per GrPixelConfig. It is used to avoid redundantly
      * performing glCheckFrameBufferStatus for the same config.
@@ -323,6 +325,8 @@ private:
                                   const GrGLInterface* intf,
                                   GrGLSLCaps* glslCaps);
 
+    void initConfigSwizzleTable(GrGLSLCaps* glslCaps);
+
     // tracks configs that have been verified to pass the FBO completeness when
     // used as a color attachment
     VerifiedColorConfigs fVerifiedColorConfigs;