initial work on updating touch bar item config without rerender

lib/browser/api/browser-window.js

@@ -212,6 +212,12 @@ BrowserWindow.prototype.setTouchBar = function (touchBar) {
   } else {
     this._setTouchBar(touchBar.toJSON())
   }
+  touchBar._owner = this
+  touchBar.items.forEach((item) => { item._owner = this; })
+}
+
+BrowserWindow.prototype._updateTouchBarItem = function (itemID) {
+  this._refreshTouchBarItem(itemID);
 }
 
 module.exports = BrowserWindow