Apparently YouTube has decided to make a new theme for the video player, but it has not been published out to the public yet and can only be accessed through editing cookies.

To get this beta theme, you have to change the value of
VISITOR_INFO1_LIVE to
Q06SngRDTGA. The only way to get this is through a extension/plug-in that can edit cookies.
EditThisCookie seems like the best one for Google Chrome as of right now.
Also yes, it works for those 360 angle videos as well.