Add TEST_MAPPING after the move.

Test: treehugger
Change-Id: Ic3b0bb70a1b3979f9f0639f9ed96ff3c8af1eea1
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..3659bee
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "libbase_test"
+    }
+  ]
+}