Add ShaderBuilders to EmitArgs and remove gettings from ProgBuilder.

src/effects/SkLumaColorFilter.cpp

Index: src/effects/SkLumaColorFilter.cpp
diff --git a/src/effects/SkLumaColorFilter.cpp b/src/effects/SkLumaColorFilter.cpp
index 7f6dd1b551fe93c31ab144974261af6094b967e5..a131b0f4345513a3671801f82d4491aecfaabe34 100644
--- a/src/effects/SkLumaColorFilter.cpp
+++ b/src/effects/SkLumaColorFilter.cpp
@@ -72,14 +72,14 @@ public:
                 args.fInputColor = "vec4(1)";
             }
 
-            GrGLSLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
-            fsBuilder->codeAppendf("\tfloat luma = dot(vec3(%f, %f, %f), %s.rgb);\n",
-                                   SK_ITU_BT709_LUM_COEFF_R,
-                                   SK_ITU_BT709_LUM_COEFF_G,
-                                   SK_ITU_BT709_LUM_COEFF_B,
-                                   args.fInputColor);
-            fsBuilder->codeAppendf("\t%s = vec4(0, 0, 0, luma);\n",
-                                   args.fOutputColor);
+            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+            fragBuilder->codeAppendf("\tfloat luma = dot(vec3(%f, %f, %f), %s.rgb);\n",
+                                     SK_ITU_BT709_LUM_COEFF_R,
+                                     SK_ITU_BT709_LUM_COEFF_G,
+                                     SK_ITU_BT709_LUM_COEFF_B,
+                                     args.fInputColor);
+            fragBuilder->codeAppendf("\t%s = vec4(0, 0, 0, luma);\n",
+                                     args.fOutputColor);
 
         }