[https://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/skullcandy-hesh-2-bluetooth-headphones-wont/b9769ff4-772c-44c8-82d6-e12d7fff13bc?auth=1|Here's a thread] with a similar issue that might have some suggestions. Have you tried connecting them to another computer? That can help diagnose the problem more exactly.
[https://support.google.com/chromebook/answer/2587653|Here's a chromebook-specific page] and [https://support.google.com/chromebook/answer/183093|another page that the first page links to]. In the second link, under Peripherals, it says that it can connect to "certain bluetooth devices", then links back to the first link. I'm assuming headphones generally fit into the category of things that can connect via bluetooth.