Add mixed samples support to XPs

include/gpu/effects/GrCoverageSetOpXP.h

Index: include/gpu/effects/GrCoverageSetOpXP.h
diff --git a/include/gpu/effects/GrCoverageSetOpXP.h b/include/gpu/effects/GrCoverageSetOpXP.h
index 6067b5eebb72cd9f07551e8cabe86d7a0cd2bce1..0ed4fc2ccefa7824eb7606424657e3b1f0a7adbf 100644
--- a/include/gpu/effects/GrCoverageSetOpXP.h
+++ b/include/gpu/effects/GrCoverageSetOpXP.h
@@ -35,11 +35,13 @@ private:
     GrCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage);
 
     GrXferProcessor* onCreateXferProcessor(const GrCaps& caps,
+                                           const GrPipelineBuilder&,
                                            const GrProcOptInfo& colorPOI,
                                            const GrProcOptInfo& coveragePOI,
                                            const DstTexture*) const override;
 
     bool willReadDstColor(const GrCaps& /*caps*/,
+                          const GrPipelineBuilder&,
                           const GrProcOptInfo& /*colorPOI*/,
                           const GrProcOptInfo& /*coveragePOI*/) const override {
         return false;