Re-re-land "added GrSkSLFP and converted DitherEffect to use it"

This reverts commit 6c48e4d11ce80fa5cfef56e13b2d5847fe94a7cc.

Bug: skia:
Change-Id: I7ee78990fc30eec545d1856e59eb6e0573089426
Reviewed-on: https://skia-review.googlesource.com/144348
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/sksl/ir/SkSLIndexExpression.h b/src/sksl/ir/SkSLIndexExpression.h
index de44b1adb2..74288e5171 100644
--- a/src/sksl/ir/SkSLIndexExpression.h
+++ b/src/sksl/ir/SkSLIndexExpression.h
@@ -62,6 +62,11 @@ struct IndexExpression : public Expression {
         return fBase->hasSideEffects() || fIndex->hasSideEffects();
     }
 
+    std::unique_ptr<Expression> clone() const override {
+        return std::unique_ptr<Expression>(new IndexExpression(fBase->clone(), fIndex->clone(),
+                                                               &fType));
+    }
+
     String description() const override {
         return fBase->description() + "[" + fIndex->description() + "]";
     }
@@ -70,6 +75,13 @@ struct IndexExpression : public Expression {
     std::unique_ptr<Expression> fIndex;
 
     typedef Expression INHERITED;
+
+private:
+    IndexExpression(std::unique_ptr<Expression> base, std::unique_ptr<Expression> index,
+                    const Type* type)
+    : INHERITED(base->fOffset, kIndex_Kind, *type)
+    , fBase(std::move(base))
+    , fIndex(std::move(index)) {}
 };
 
 } // namespace