function _createFullEditorForDocument(document) {
        // Create editor; make it initially invisible
        var container = _editorHolder.get(0);
        var editor = _createEditorForDocument(document, true, container);
        editor.setVisible(false);
    }
@private
Creates a new "full-size" (not inline) Editor for the given Document, and sets it as the
Document's master backing editor. The editor is not yet visible; to show it, use
DocumentManager.setCurrentDocument().
Semi-private: should only be called within this module or by Document.
@param {!Document} document  Document whose main/full Editor to create