Add ShaderBuilders to EmitArgs and remove gettings from ProgBuilder.

src/gpu/effects/GrCoverageSetOpXP.cpp

Index: src/gpu/effects/GrCoverageSetOpXP.cpp
diff --git a/src/gpu/effects/GrCoverageSetOpXP.cpp b/src/gpu/effects/GrCoverageSetOpXP.cpp
index 86cd50292ca7204cb083b23ae3de498329513c71..bcdb6d81dcf89c2838744e18af09240709ff0f58 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -72,12 +72,12 @@ public:
 private:
     void emitOutputsForBlendState(const EmitArgs& args) override {
         const CoverageSetOpXP& xp = args.fXP.cast<CoverageSetOpXP>();
-        GrGLSLXPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
+        GrGLSLXPFragmentBuilder* fragBuilder = args.fXPFragBuilder;
 
         if (xp.invertCoverage()) {
-            fsBuilder->codeAppendf("%s = 1.0 - %s;", args.fOutputPrimary, args.fInputCoverage);
+            fragBuilder->codeAppendf("%s = 1.0 - %s;", args.fOutputPrimary, args.fInputCoverage);
         } else {
-            fsBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, args.fInputCoverage);
+            fragBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, args.fInputCoverage);
         }
     }