Bazel: pass through visibility to underlying genproto rule

Reviewers: zarko

Reviewed By: zarko

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D208

tools/build_rules/genproto.bzl

@@ -160,7 +160,7 @@ genproto = rule(
 )
 
 def genproto_all(name, src, visibility=None, deps = [], has_services = None, go_package_prefix = None):
-  genproto(name = name, src = src, deps = deps, has_services = has_services, go_package_prefix = go_package_prefix)
+  genproto(name = name, src = src, visibility=visibility, deps = deps, has_services = has_services, go_package_prefix = go_package_prefix)
   # We'll guess that the repository is set up such that a .proto in
   # //foo/bar has the package foo.bar. `location` is substituted with the
   # relative path to its label from the workspace root.