If target is Google Maps, position is impossible to get

I tried this code

`final flutterWebviewPlugin = new FlutterWebviewPlugin();
var url = "https://www.google.com/maps/";
flutterWebviewPlugin.launch(
url,
withJavascript: true,
);`

The interface works fine, but it's impossible for google maps to get the position of the user.
No permissions are asked and it just doesn't work.

首先，使用启用 JavaScript 的 Google Maps URL，通过 FlutterWebviewPlugin.launch 重现该问题。调查此插件如何处理嵌入页面的位置权限；当 Google Maps 能够请求并获取用户位置，且不会破坏现有界面时，即视为完成。

由索引模型根据 Issue 内容生成。