Fixed DSLParser code rot

Where DSLParser is #ifdef'ed out, it had experienced some code rot and
was no longer building. This fixes it to be able to successfully build
when SKSL_DSL_PARSER is set to 1.

Change-Id: I5846b05ba3342b5b1502663577663e332c55529b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/442976
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/dsl/DSLFunction.cpp b/src/sksl/dsl/DSLFunction.cpp
index 18a8892..78bafb0 100644
--- a/src/sksl/dsl/DSLFunction.cpp
+++ b/src/sksl/dsl/DSLFunction.cpp
@@ -60,6 +60,7 @@
     if (fDecl) {
         for (size_t i = 0; i < params.size(); ++i) {
             params[i]->fVar = fDecl->parameters()[i];
+            params[i]->fInitialized = true;
         }
         // We don't know when this function is going to be defined; go ahead and add a prototype in
         // case the definition is delayed. If we end up defining the function immediately, we'll