So Chocolatey doesn't have an official OneGet provider released yet. For more information see http://us8.campaign-archive2.com/?u=86a6d80146a0da7f2223712e4&id=0165685e1f
Reposting the important parts:
The current Chocolatey OneGet provider is not yet complete. In fact it is a preview that was written in April 2014 and is based on a two year old Chocolatey (even then it doesn't have all the features). I would consider it broken and incompatible with the current choco CLI. We've heard reports of it working for some folks, but for the vast majority of folks, you may run into issues with it. So we recommend that you don't use it until we announce that it is ready to use, which will be somewhere around the end of this year or in Q1/Q2 2016. We are looking for folks to help out with this. If you are interested, please reach out at https://github.com/chocolatey/chocolatey-oneget.