added support for PLS path rendering

include/gpu/effects/GrPorterDuffXferProcessor.h

Index: include/gpu/effects/GrPorterDuffXferProcessor.h
diff --git a/include/gpu/effects/GrPorterDuffXferProcessor.h b/include/gpu/effects/GrPorterDuffXferProcessor.h
index 457c6eabc8c4f451d0935b6bc0b505863e6c5836..865ef44253d7ba15dcf0ca6abac872f8c4708d82 100644
--- a/include/gpu/effects/GrPorterDuffXferProcessor.h
+++ b/include/gpu/effects/GrPorterDuffXferProcessor.h
@@ -60,9 +60,9 @@ private:
                                            bool hasMixedSamples,
                                            const DstTexture*) const override;
 
-    bool willReadDstColor(const GrCaps& caps,
-                          const GrPipelineOptimizations& optimizations,
-                          bool hasMixedSamples) const override;
+    bool onWillReadDstColor(const GrCaps& caps,
+                            const GrPipelineOptimizations& optimizations,
+                            bool hasMixedSamples) const override;
 
     bool onIsEqual(const GrXPFactory& xpfBase) const override {
         const GrPorterDuffXPFactory& xpf = xpfBase.cast<GrPorterDuffXPFactory>();