public void registerCompletionProviders(final String editorId,
                                            final AceCompletionProvider... completionProviders) {
        registerCompletionProviders(editorId, null, completionProviders);
    }
Register mode agnostic completion providers specific to an editor
stroom-core-client-widget/src/main/java/stroom/editor/client/presenter/DelegatingAceCompleter.java