function openDocument(doc, pane, editorOptions) {
        var perfTimerName = PerfUtils.markStart("EditorManager.openDocument():\t" + (!doc || doc.file.fullPath));

        if (doc && pane) {
            _showEditor(doc, pane, editorOptions);
        }

        PerfUtils.addMeasurement(perfTimerName);
    }
Opens the specified document in the given pane
@param {!Document} doc - the document to open
@param {!Pane} pane - the pane to open the document in
@param {!Object} editorOptions - If specified, contains
editor options that can be passed to CodeMirror
@return {boolean} true if the file can be opened, false if not