Add ShaderBuilders to EmitArgs and remove gettings from ProgBuilder.

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 003191d39781e7beb86a304c741d1f70aeebfca0..1c97b017ff157f0205913bdc318d0fc414ff9fc7 100644
--- a/src/effects/gradients/SkGradientShaderPriv.h
+++ b/src/effects/gradients/SkGradientShaderPriv.h
@@ -421,6 +421,7 @@ protected:
     // 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(GrGLSLFPBuilder* builder,
+                   GrGLSLFragmentBuilder* fragBuilder,
                    const GrGradientEffect&,
                    const char* gradientTValue,
                    const char* outputColor,