Cascade shutdown of instances

mojo/shell/tests/lifecycle/parent_manifest.json

Index: mojo/shell/tests/lifecycle/parent_manifest.json
diff --git a/mojo/shell/tests/lifecycle/parent_manifest.json b/mojo/shell/tests/lifecycle/parent_manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..25191c86cacba95100927e61200761cd775f39af
--- /dev/null
+++ b/mojo/shell/tests/lifecycle/parent_manifest.json
@@ -0,0 +1,12 @@
+{
+  "manifest_version":  1,
+  "name": "mojo:lifecycle_unittest_parent",
+  "display_name": "Lifecycle Unittest Parent",
+  "capabilities": {
+    "required": {
+      "mojo:lifecycle_unittest_app": {
+        "interfaces": [ "mojo::shell::test::mojom::LifecycleControl" ]
+      }
+    }
+  }
+}