Add types/global import to GrApp

Google-bug-id: b/260980834
Release-Notes: skip
Change-Id: Iee67098da64297bdcbb97d36cbdfedf9e17745da

polygerrit-ui/app/elements/gr-app.ts

diff --git a/polygerrit-ui/app/elements/gr-app.ts b/polygerrit-ui/app/elements/gr-app.ts
index ded0626..40869a9 100644
--- a/polygerrit-ui/app/elements/gr-app.ts
+++ b/polygerrit-ui/app/elements/gr-app.ts
@@ -5,6 +5,7 @@
  */
 import {safeTypesBridge} from '../utils/safe-types-util';
 import './font-roboto-local-loader';
+import '../types/globals';
 // Sets up global Polymer variable, because plugins requires it.
 import '../scripts/bundled-polymer';