Add SkVM output to skslc

Change-Id: Ida9d81a8d4e530cb3055f01418a2ad2893ae86db
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/345422
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/sksl/SkSLVMGenerator.h b/src/sksl/SkSLVMGenerator.h
index 956c707..71a3a95 100644
--- a/src/sksl/SkSLVMGenerator.h
+++ b/src/sksl/SkSLVMGenerator.h
@@ -32,6 +32,8 @@
                           skvm::Coord local,
                           SampleChildFn sampleChild);
 
+bool testingOnly_ProgramToSkVMShader(const Program& program, skvm::Builder* builder);
+
 }  // namespace SkSL
 
 #endif