Bug 1571972 - Re-export RendererError as a public type r=jrmuizel
Bug 1571972 - Re-export RendererError as a public type r=jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D51897

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/f2a5d56c886dd7f31aaebfcf6016539aa1d5d42f

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