Make protocOpts() public.

RELNOTES:
Make protocOpts() publicly accessible.
PiperOrigin-RevId: 430726712

src/main/java/com/google/devtools/build/lib/rules/proto/ProtoConfiguration.java

@@ -218,9 +218,8 @@ public ProtoConfiguration(BuildOptions buildOptions) {
     this.options = options;
   }
 
-  @StarlarkMethod(name = "protoc_opts", useStarlarkThread = true, documented = false)
-  public ImmutableList<String> protocOptsForStarlark(StarlarkThread thread) throws EvalException {
-    ProtoCommon.checkPrivateStarlarkificationAllowlist(thread);
+  @StarlarkMethod(name = "experimental_protoc_opts", structField = true, documented = false)
+  public ImmutableList<String> protocOptsForStarlark() throws EvalException {
     return protocOpts();
   }
 

src/main/starlark/builtins_bzl/common/proto/proto_common.bzl

@@ -30,7 +30,7 @@ def _create_proto_compile_action(
         resource_set = None):
     """Creates proto compile action for compiling *.proto files to language specific sources.
 
-    It uses proto configuration fragment to access protoc_opts and strict_proto_deps flags.
+    It uses proto configuration fragment to access experimental_protoc_opts and strict_proto_deps flags.
 
     Args:
       ctx: The rule context, used to create the action and to obtain label.
@@ -68,7 +68,7 @@ def _create_proto_compile_action(
             else:
                 args.add(arg)
 
-    args.add_all(ctx.fragments.proto.protoc_opts())
+    args.add_all(ctx.fragments.proto.experimental_protoc_opts)
 
     # Include maps
     # For each import, include both the import as well as the import relativized against its