Add ShaderBuilders to EmitArgs and remove gettings from ProgBuilder.

src/gpu/effects/GrDisableColorXP.cpp

Index: src/gpu/effects/GrDisableColorXP.cpp
diff --git a/src/gpu/effects/GrDisableColorXP.cpp b/src/gpu/effects/GrDisableColorXP.cpp
index 792d14653cb7d203c492371a7423ef6b271b23fa..2a0de5fedab31d956191bb1fd777a9019bfe67a0 100644
--- a/src/gpu/effects/GrDisableColorXP.cpp
+++ b/src/gpu/effects/GrDisableColorXP.cpp
@@ -63,8 +63,8 @@ private:
         // This emit code should be empty. However, on the nexus 6 there is a driver bug where if
         // you do not give gl_FragColor a value, the gl context is lost and we end up drawing
         // nothing. So this fix just sets the gl_FragColor arbitrarily to 0.
-        GrGLSLXPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
-        fsBuilder->codeAppendf("%s = vec4(0);", args.fOutputPrimary);
+        GrGLSLXPFragmentBuilder* fragBuilder = args.fXPFragBuilder;
+        fragBuilder->codeAppendf("%s = vec4(0);", args.fOutputPrimary);
     }
 
     void onSetData(const GrGLSLProgramDataManager&, const GrXferProcessor&) override {}