Feature: allow external driver to be passed in

[grawk]

External Driver

Allow an external driver to be passed in. allows full driver customization, not constrained by the internal create method.

Specify via config as:

{
  "driver": "require:./myDriver"
}
...

Example of myDriver.js:

const {Builder} = require('selenium-webdriver');
const {Options} = require('selenium-webdriver/chrome');

module.exports = function () {
  let copts = new Options().setMobileEmulation({deviceName: 'Nexus 5X'}).setChromeBinaryPath('/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome');
  let driver = new Builder()
    .forBrowser('chrome')
    .setChromeOptions(
      copts)
    .build();
  return driver;
}