Putting tsi util in header so that it can be used elsewhere.

src/core/security/security_connector.c

@@ -82,7 +82,7 @@ static const char *ssl_cipher_suites(void) {
 /* -- Common methods. -- */
 
 /* Returns the first property with that name. */
-static const tsi_peer_property *tsi_peer_get_property_by_name(
+const tsi_peer_property *tsi_peer_get_property_by_name(
     const tsi_peer *peer, const char *name) {
   size_t i;
   if (peer == NULL) return NULL;

src/core/security/security_connector.h

@@ -198,4 +198,8 @@ typedef struct {
 grpc_security_status grpc_ssl_server_security_connector_create(
     const grpc_ssl_server_config *config, grpc_security_connector **sc);
 
+/* Util. */
+const tsi_peer_property *tsi_peer_get_property_by_name(
+    const tsi_peer *peer, const char *name);
+
 #endif /* GRPC_INTERNAL_CORE_SECURITY_SECURITY_CONNECTOR_H */