Bug 1700151 - Do not require wp_viewporter for non-native mode, r=gw
Bug 1700151 - Do not require wp_viewporter for non-native mode, r=gw

We don't use it there. This allows the example compositor to be run
on compositors that don't yet support wp_viewporter such as kwin,
even if only in non-native mode.

Differential Revision: https://phabricator.services.mozilla.com/D110745

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/2ad841f888fce48cc53f9c70f827ee8144bea496

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender