Expose gpr_asprintf and gpr_strdup
diff --git a/test/core/transport/chttp2/timeout_encoding_test.c b/test/core/transport/chttp2/timeout_encoding_test.c
index daaae1d..5bfb9cf 100644
--- a/test/core/transport/chttp2/timeout_encoding_test.c
+++ b/test/core/transport/chttp2/timeout_encoding_test.c
@@ -39,6 +39,7 @@
#include "src/core/support/string.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
#include <grpc/support/useful.h>
#include "test/core/util/test_config.h"