Bug 1617279 - Read list of extensions at startup in GVE. r=snorp

Differential Revision: https://phabricator.services.mozilla.com/D63720

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview_example/src/main/java/org/mozilla/geckoview_example/GeckoViewActivity.java

@@ -284,6 +284,7 @@ class WebExtensionManager implements WebExtension.ActionDelegate,
                                TabSessionManager tabManager) {
         mTabManager = tabManager;
         mRuntime = runtime;
+        refreshExtensionList();
     }
 }