Add ShaderBuilders to EmitArgs and remove gettings from ProgBuilder.

src/effects/gradients/SkLinearGradient.cpp

Index: src/effects/gradients/SkLinearGradient.cpp
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index ada9d70b6a19af49520d1eaaebd9fad6678704f0..330b2377f4d14a1e3eb6db991c77e0fc5135ab13 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -528,9 +528,13 @@ const GrFragmentProcessor* GrLinearGradient::TestCreate(GrProcessorTestData* d)
 void GrGLLinearGradient::emitCode(EmitArgs& args) {
     const GrLinearGradient& ge = args.fFp.cast<GrLinearGradient>();
     this->emitUniforms(args.fBuilder, ge);
-    SkString t = args.fBuilder->getFragmentShaderBuilder()->ensureFSCoords2D(args.fCoords, 0);
+    SkString t = args.fFragBuilder->ensureFSCoords2D(args.fCoords, 0);
     t.append(".x");
-    this->emitColor(args.fBuilder, ge, t.c_str(), args.fOutputColor, args.fInputColor,
+    this->emitColor(args.fBuilder,
+                    args.fFragBuilder,
+                    ge, t.c_str(),
+                    args.fOutputColor,
+                    args.fInputColor,
                     args.fSamplers);
 }