Add an option for mobile emulation

The problem

We often want to open browser in “mobile emulation” mode. We would like to have an option in Selenide to do it easily.

Details

Currently we have to implement own WebdriverProvider to add this option:

  Map<String, String> mobileEmulation = new HashMap<>();
  mobileEmulation.put("deviceName", "Nexus 5");
  ChromeOptions chromeOptions = new ChromeOptions();
  chromeOptions.setExperimentalOption("mobileEmulation", mobileEmulation);

See https://chromedriver.chromium.org/mobile-emulation

[asolntsev]

I have another idea.

1. Currently we support such a system property: -Dchromeoptions.args=--diagnostics,--disable-blink-features.
2. We could also support similar system property: "-Dchromeoptions.mobileEmulation=deviceName=Nexus 5"

In this case user will be able to set up any settings for mobile browser without need to change Selenide source.

[rosolko]

@vinogradoff So, instead of one config parameter such as headless you should pass a lot of for device name and additional - resolution, ration and touch simulation for example. So isn’t it simpler to use custom driver provider for this case?