Add test API for extra APKs

Bug: 303201498
Test: atest MicrodroidTests
Change-Id: Iaae9274d704c6cbf47be31902820872c996a701e
diff --git a/tests/vmshareapp/assets/vmshareapp.txt b/tests/vmshareapp/assets/vmshareapp.txt
new file mode 100644
index 0000000..02fdd71
--- /dev/null
+++ b/tests/vmshareapp/assets/vmshareapp.txt
@@ -0,0 +1 @@
+Marker file for the vmshareapp APK