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, 7 insertions, 0 deletions

diff --git a/src/sksl/ir/SkSLReturnStatement.h b/src/sksl/ir/SkSLReturnStatement.h
index 1b479b8097..774d803011 100644
--- a/src/sksl/ir/SkSLReturnStatement.h
+++ b/src/sksl/ir/SkSLReturnStatement.h
@@ -24,6 +24,13 @@ struct ReturnStatement : public Statement {
     : INHERITED(expression->fOffset, kReturn_Kind)
     , fExpression(std::move(expression)) {}
 
+    std::unique_ptr<Statement> clone() const override {
+        if (fExpression) {
+            return std::unique_ptr<Statement>(new ReturnStatement(fExpression->clone()));
+        }
+        return std::unique_ptr<Statement>(new ReturnStatement(fOffset));
+    }
+
     String description() const override {
         if (fExpression) {
             return "return " + fExpression->description() + ";";