When you are creating a new instance of analytics.js by running

`ga('create', 'UA-XXXXXXX-Y', {'cookieDomain': 'none'});`

GA creates a unique client Id.
I want to fetch this id and use it for my own purposes, 
but I can find only [setter](https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#clientId) for this parameter but can't find any getter method to get it.

GA send it later in a parameter called `&cid=123123.232323`

Does anyone knows how do I get it?