Implement the sign-in screen test app for manual testing

chrome/test/data/extensions/signin_screen_test_app/app/manifest.json

Index: chrome/test/data/extensions/signin_screen_test_app/app/manifest.json
diff --git a/chrome/test/data/extensions/signin_screen_test_app/app/manifest.json b/chrome/test/data/extensions/signin_screen_test_app/app/manifest.json
index d331322445bf118291f11d6a438618e6336a1db9..45bf15c8974de9642955f514b46a461325c10dc8 100644
--- a/chrome/test/data/extensions/signin_screen_test_app/app/manifest.json
+++ b/chrome/test/data/extensions/signin_screen_test_app/app/manifest.json
@@ -2,10 +2,11 @@
   "manifest_version": 2,
   "name": "Sign-in Screen Test App",
   "description": "The app for testing the apps installation in the Chrome OS sign-in profile",
-  "version": "2.0",
+  "version": "3.0",
   "app": {
     "background": {
       "scripts": ["background.js"]
     }
-  }
+  },
+  "permissions": ["certificateProvider"]
 }