A simple test site for user gestures on the Web.
See crbug.com/760848 for the discussion around this.
Public test site: This lets you use the basic test but the fetch handler will return ASAP, rather than having a delay. To get a time-delayed response, you need to run a local server.
To run a local server, clone this repo, and run:
$ python3 -m http.server --cgi 8080
Then point your browser at http://localhost:8080/fetch-gesture.html.