Add mixed samples support to XPs

src/gpu/effects/GrDisableColorXP.cpp

Index: src/gpu/effects/GrDisableColorXP.cpp
diff --git a/src/gpu/effects/GrDisableColorXP.cpp b/src/gpu/effects/GrDisableColorXP.cpp
index 365a569b7af778707c826e532b22230d30719d28..e3f588ad657ef5dd1c89f32fb99f9bad6092a53d 100644
--- a/src/gpu/effects/GrDisableColorXP.cpp
+++ b/src/gpu/effects/GrDisableColorXP.cpp
@@ -101,6 +101,7 @@ GrXferProcessor*
 GrDisableColorXPFactory::onCreateXferProcessor(const GrCaps& caps,
                                                const GrProcOptInfo& colorPOI,
                                                const GrProcOptInfo& covPOI,
+                                               bool hasMixedSamples,
                                                const DstTexture* dst) const {
     return DisableColorXP::Create();
 }