Allow Flash content in Chrome 69 running via chromedriver

Given the flag --disable-features=EnableEphemeralFlashPermission has been removed in Chrome 71 which severely cripples Flash test automation I would like to share our solution.

public class FlashPolicyHelper {

    private final ChromeDriver driver;

    public FlashPolicyHelper(ChromeDriver driver) {
        this.driver = driver;
    }

    public FlashPolicyHelper addSite(String site) {
        this.driver.get("chrome://settings/content/siteDetails?site=" + site);
        WebElement root1 = driver.findElement(By.tagName("settings-ui"));
        WebElement shadowRoot1 = expandRootElement(root1);
        WebElement root2 = shadowRoot1.findElement(getByIdentifier("id=container"));
        WebElement main = root2.findElement(getByIdentifier("id=main"));
        WebElement shadowRoot3 = expandRootElement(main);
        WebElement shadowRoot4 = shadowRoot3.findElement(getByIdentifier("class=showing-subpage"));
        WebElement shadowRoot5 = expandRootElement(shadowRoot4);
        WebElement shadowRoot6 = shadowRoot5.findElement(getByIdentifier("id=advancedPage"));
        WebElement shadowRoot7 = shadowRoot6.findElement(By.tagName("settings-privacy-page"));
        WebElement shadowRoot8 = expandRootElement(shadowRoot7);
        WebElement shadowRoot9 = shadowRoot8.findElement(getByIdentifier("id=pages"));
        WebElement shadowRoot10 = shadowRoot9.findElement(By.tagName("settings-subpage"));
        WebElement shadowRoot11 = shadowRoot10.findElement(By.tagName("site-details"));
        WebElement shadowRoot12 = expandRootElement(shadowRoot11);
        WebElement shadowRoot13 = shadowRoot12.findElement(By.id("plugins"));
        WebElement shadowRoot14 = expandRootElement(shadowRoot13);
        new Select(shadowRoot14.findElement(By.id("permission"))).selectByValue("allow");
        return this;
    }

    private By getByIdentifier(String identifier) {
        String[] identifiers = identifier.split("=");

        return identifiers[0].equals("id") ? By.id(identifiers[1]) :
                By.className(identifiers[1]);
    }

    private WebElement expandRootElement(WebElement element) {
        return (WebElement) driver.executeScript("return arguments[0].shadowRoot",element);
    }
}

The helper should be called after instantiating the ChromeDriver.

 driver = new ChromeDriver(options);
 new FlashPolicyHelper(driver).addSite("https://your.site").addSite("https://another.site");

Thanks everyone for answers.

I finally have found the solution. In order to enable flash progrmatically since Chrome 69 we have to do 2 things:

1. Disable Ephemeral Flash Permissions (to enable list of allowed for Flash sites) and
2. Add all sites to that list.

See the following code on Java:

ChromeOptions options = new ChromeOptions();
// disable ephemeral flash permissions flag
options.addArguments("--disable-features=EnableEphemeralFlashPermission");
Map<String, Object> prefs = new HashMap<>();
// Enable flash for all sites for Chrome 69
prefs.put("profile.content_settings.exceptions.plugins.*,*.setting", 1);

options.setExperimentalOption("prefs", prefs);
nestedDriver = new ChromeDriver(options);

Follow these steps:

1. Input this URL in Chrome: chrome://flags/
2. On search inputbox, digit: ephemeral flash
3. Choose "disabled" option.

This will not ask to run Flash Player for further sessions in Chrome 69.