Make GrGLSLProgramBuilder base class for ProgramBuilder

src/effects/gradients/SkGradientShaderPriv.h

Index: src/effects/gradients/SkGradientShaderPriv.h
diff --git a/src/effects/gradients/SkGradientShaderPriv.h b/src/effects/gradients/SkGradientShaderPriv.h
index 2286c22fd5045d844a7f52f793dbefe155e2b0db..a295b5cf93448237fa0fc70ceed23435ba5e99b9 100644
--- a/src/effects/gradients/SkGradientShaderPriv.h
+++ b/src/effects/gradients/SkGradientShaderPriv.h
@@ -414,13 +414,13 @@ protected:
 
     // Emits the uniform used as the y-coord to texture samples in derived classes. Subclasses
     // should call this method from their emitCode().
-    void emitUniforms(GrGLFPBuilder* builder, const GrGradientEffect&);
+    void emitUniforms(GrGLSLFPBuilder* builder, const GrGradientEffect&);
 
 
     // emit code that gets a fragment's color from an expression for t; Has branches for 3 separate
     // control flows inside -- 2 color gradients, 3 color symmetric gradients (both using
     // native GLSL mix), and 4+ color gradients that use the traditional texture lookup.
-    void emitColor(GrGLFPBuilder* builder,
+    void emitColor(GrGLSLFPBuilder* builder,
                    const GrGradientEffect&,
                    const char* gradientTValue,
                    const char* outputColor,