Make GrGLSLProgramBuilder base class for ProgramBuilder

src/gpu/effects/GrPorterDuffXferProcessor.cpp

Index: src/gpu/effects/GrPorterDuffXferProcessor.cpp
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
index a7f390a5dc5844fafaf25e23ddeee35807fcebce..28663805c1f45790b6cbdbebf2c055ba70b82a8a 100644
--- a/src/gpu/effects/GrPorterDuffXferProcessor.cpp
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -543,7 +543,7 @@ public:
     }
 
 private:
-    void emitBlendCodeForDstRead(GrGLXPBuilder* pb, const char* srcColor, const char* dstColor,
+    void emitBlendCodeForDstRead(GrGLSLXPBuilder* pb, const char* srcColor, const char* dstColor,
                                  const char* outColor, const GrXferProcessor& proc) override {
         const ShaderPDXferProcessor& xp = proc.cast<ShaderPDXferProcessor>();
         GrGLXPFragmentBuilder* fsBuilder = pb->getFragmentShaderBuilder();