Import tokio-test v0.4.0

Bug: 179649848
Test: atest
Change-Id: I5e69ddc88c6f8d6d8a54927eb21736c9589d0f68
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..888a4fb
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+  "git": {
+    "sha1": "a66017f04985f5e7b7cb981e370e78a7291a5537"
+  }
+}