@Override
        public boolean updateVisuals(ICustomTabsCallback callback, Bundle bundle) {
            return CustomTabsService.this.updateVisuals(
                    new CustomTabsSessionToken(callback, getSessionIdFromBundle(bundle)), bundle);
        }
File is a splash image to be shown on top of a Trusted Web Activity while the web contents
are loading.
customtabs/src/android/support/customtabs/CustomTabsService.java