Add ShaderBuilders to EmitArgs and remove gettings from ProgBuilder.

src/gpu/effects/GrDitherEffect.cpp

Index: src/gpu/effects/GrDitherEffect.cpp
diff --git a/src/gpu/effects/GrDitherEffect.cpp b/src/gpu/effects/GrDitherEffect.cpp
index e6f3fbe5cf0bca765be853961b2e36c42f9ddd3a..37cc1ae5701eb7f6a663e97393690d8370df4db1 100644
--- a/src/gpu/effects/GrDitherEffect.cpp
+++ b/src/gpu/effects/GrDitherEffect.cpp
@@ -73,7 +73,7 @@ GLDitherEffect::GLDitherEffect(const GrProcessor&) {
 }
 
 void GLDitherEffect::emitCode(EmitArgs& args) {
-    GrGLSLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
+    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
     // Generate a random number based on the fragment position. For this
     // random number generator, we use the "GLSL rand" function
     // that seems to be floating around on the internet. It works under
@@ -83,11 +83,11 @@ void GLDitherEffect::emitCode(EmitArgs& args) {
 
     // For each channel c, add the random offset to the pixel to either bump
     // it up or let it remain constant during quantization.
-    fsBuilder->codeAppendf("\t\tfloat r = "
-                           "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.5453);\n",
-                           fsBuilder->fragmentPosition());
-    fsBuilder->codeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n",
-                           args.fOutputColor, GrGLSLExpr4(args.fInputColor).c_str());
+    fragBuilder->codeAppendf("\t\tfloat r = "
+                             "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.5453);\n",
+                             fragBuilder->fragmentPosition());
+    fragBuilder->codeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n",
+                             args.fOutputColor, GrGLSLExpr4(args.fInputColor).c_str());
 }
 
 //////////////////////////////////////////////////////////////////////////////