automatically generate clone() methods for SkSL fragment processors

Bug: skia:
Change-Id: Ib7b90f20d2b1558aad14f38f95c7c884e654c96d
Reviewed-on: https://skia-review.googlesource.com/28620
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/effects/GrCircleBlurFragmentProcessor.h b/src/effects/GrCircleBlurFragmentProcessor.h
index 4a450d7..9ef204d 100644
--- a/src/effects/GrCircleBlurFragmentProcessor.h
+++ b/src/effects/GrCircleBlurFragmentProcessor.h
@@ -23,6 +23,8 @@
 
     static sk_sp<GrFragmentProcessor> Make(GrResourceProvider* resourceProvider,
                                            const SkRect& circle, float sigma);
+    GrCircleBlurFragmentProcessor(const GrCircleBlurFragmentProcessor& src);
+    sk_sp<GrFragmentProcessor> clone() const override;
     const char* name() const override { return "CircleBlurFragmentProcessor"; }
 
 private: