Swizzle shader output and blend when using GL_RED to implement kAlpha_8_GrPixelConfig

src/gpu/gl/GrGLProgramDesc.h

Index: src/gpu/gl/GrGLProgramDesc.h
diff --git a/src/gpu/gl/GrGLProgramDesc.h b/src/gpu/gl/GrGLProgramDesc.h
index 7ce79ecae9e33ab4892d28e17a554a7d498a34b8..0ebf6a228ec8906260e431d5ad89629ffcbbbdfb 100644
--- a/src/gpu/gl/GrGLProgramDesc.h
+++ b/src/gpu/gl/GrGLProgramDesc.h
@@ -52,14 +52,13 @@ public:
      *                        general draw information, as well as the specific color, geometry,
      *                        and coverage stages which will be used to generate the GL Program for
      *                        this optstate.
-     * @param GrGLGpu  A GL Gpu, the caps and Gpu object are used to output processor specific
-     *                 parts of the descriptor.
+     * @param GrGLSLCaps     Capabilities of the GLSL backend.
      * @param GrProgramDesc  The built and finalized descriptor
      **/
     static bool Build(GrProgramDesc*,
                       const GrPrimitiveProcessor&,
                       const GrPipeline&,
-                      const GrGLGpu*);
+                      const GrGLSLCaps&);
 };
 
 #endif