Add content handling support to B&R

Fixes: 376172272
Flag: android.app.live_wallpaper_content_handling
Test: manually verified correct B&R with flag enabled and disabled
Change-Id: I752d4efa724a039af433820794e5159dbaec440a
diff --git a/packages/WallpaperBackup/Android.bp b/packages/WallpaperBackup/Android.bp
index b8e0d42..b0c0c3a 100644
--- a/packages/WallpaperBackup/Android.bp
+++ b/packages/WallpaperBackup/Android.bp
@@ -48,7 +48,9 @@
     static_libs: [
         "androidx.test.core",
         "androidx.test.rules",
+        "flag-junit",
         "mockito-target-minus-junit4",
+        "platform-test-annotations",
         "truth",
     ],
     resource_dirs: ["test/res"],