libsnapshot: Add vts_userspace_snapshot_test

Toggle virtual_ab.userspace.snapshots.enabled to test
both:

1: vts_libsnapshot_test - testing kernel dm-snapshot
2: vts_userspace_snapshot_test - testing user-space snapshot

Bug: 193863443
Test: vts_userspace_snapshot_test
Signed-off-by: Akilesh Kailash <akailash@google.com>
Change-Id: I873e7476d71feb9a2e12054e968443bd22ee817c

fs_mgr/libsnapshot/Android.bp

@@ -258,11 +258,62 @@ cc_defaults {
     require_root: true,
 }
 
+cc_defaults {
+    name: "userspace_snapshot_test_defaults",
+    defaults: ["libsnapshot_defaults"],
+    srcs: [
+        "partition_cow_creator_test.cpp",
+        "snapshot_metadata_updater_test.cpp",
+        "snapshot_reader_test.cpp",
+        "userspace_snapshot_test.cpp",
+        "snapshot_writer_test.cpp",
+    ],
+    shared_libs: [
+        "libbinder",
+        "libcrypto",
+        "libhidlbase",
+        "libprotobuf-cpp-lite",
+        "libutils",
+        "libz",
+    ],
+    static_libs: [
+        "android.hardware.boot@1.0",
+        "android.hardware.boot@1.1",
+        "libbrotli",
+        "libc++fs",
+        "libfs_mgr_binder",
+        "libgsi",
+        "libgmock",
+        "liblp",
+        "libsnapshot",
+        "libsnapshot_cow",
+        "libsnapshot_test_helpers",
+        "libsparse",
+    ],
+    header_libs: [
+        "libstorage_literals_headers",
+    ],
+    test_suites: [
+        "vts",
+        "device-tests"
+    ],
+    test_options: {
+        min_shipping_api_level: 29,
+    },
+    auto_gen_config: true,
+    require_root: true,
+}
+
 cc_test {
     name: "vts_libsnapshot_test",
     defaults: ["libsnapshot_test_defaults"],
 }
 
+cc_test {
+    name: "vts_userspace_snapshot_test",
+    defaults: ["userspace_snapshot_test_defaults"],
+}
+
 cc_binary {
     name: "snapshotctl",
     srcs: [