automated tool for chrome emulating mobile using the device toolbar

I have developed a mobile HTML5 interface and I want to replay scripts to test it and to regression test scenarios when I make changes

I am very techy but not familiar with the inner workings of the automated testing tools out there.

The problem I have is that even though there are a number of tools to automate testing in chrome I can't find one that can first put chrome in mobile emulation mode which I currently do by opening 'inspect' and then clicking on the 'device toolbar' icon.

I tried installing selenum and using the webdriver and following some very complecated instructions but alas none of them worked.

So my question really is to ask if there is a sort of pain free way of doing this.

In fact I don't mind if the testing is done in chrome or is done via an iphone or android emulator just so long as it works. I have code and android studio installed and use both so I have all the base components installed.