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 4d5be2c9a0849738d206d54d412b4eba555c8696..2dc65985daec04665920254c2ae08d60dad479aa 100644
--- a/src/gpu/effects/GrDisableColorXP.cpp
+++ b/src/gpu/effects/GrDisableColorXP.cpp
@@ -27,8 +27,6 @@ public:
 
     GrGLXferProcessor* createGLInstance() const override;
 
-    bool hasSecondaryOutput() const override { return false; }
-
 private:
     DisableColorXP();
 
@@ -101,6 +99,7 @@ GrDisableColorXPFactory::GrDisableColorXPFactory() {
 
 GrXferProcessor*
 GrDisableColorXPFactory::onCreateXferProcessor(const GrCaps& caps,
+                                               const GrPipelineBuilder&,
                                                const GrProcOptInfo& colorPOI,
                                                const GrProcOptInfo& covPOI,
                                                const DstTexture* dst) const {