Unwanted Prevent Sleep behavior when using media in BrowserWindow

[karaggeorge]

Is your feature request related to a problem? Please describe.
When having media like a video in a BrowserWindow, the app prevents the system from going to sleep (on MacOS, have not tested Windows), much like chrome does. If that is not the desired behavior, there would be nice to have an API control wether that should happen or not

Describe the solution you'd like
An API that can enable/disable the "prevent from going to sleep" behavior

Describe alternatives you've considered
A workaround we have found for now is pausing the media when the BrowserWindow is blurred