Update TEST_MAPPING

Test: None

Bug: 233924440
Change-Id: I69ea56de3ceab942c697a2ad9ef5a059b5a6c539
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..958c404
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,2 @@
+// Generated by update_crate_tests.py for tests that depend on this crate.
+{}