added GrSkSLFP and converted DitherEffect to use it

Bug: skia:
Change-Id: I84b71165eab1712355f3c7669cee2d33d259f3df
Reviewed-on: https://skia-review.googlesource.com/124504
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/sksl/ir/SkSLVariableReference.h b/src/sksl/ir/SkSLVariableReference.h
index 14ddf796ff..405a5d1f55 100644
--- a/src/sksl/ir/SkSLVariableReference.h
+++ b/src/sksl/ir/SkSLVariableReference.h
@@ -49,6 +49,10 @@ struct VariableReference : public Expression {
         return 0 != (fVariable.fModifiers.fFlags & Modifiers::kConst_Flag);
     }
 
+    std::unique_ptr<Expression> clone() const override {
+        return std::unique_ptr<Expression>(new VariableReference(fOffset, fVariable, fRefKind));
+    }
+
     String description() const override {
         return fVariable.fName;
     }