[PATCH 1/2] winegstreamer: Implement pausing the media source.

[Zebediah Figura (she/her)]

I agree with Derek's comment here. Assuming that buffering samples like 
this is the right thing to do, I also wonder:

* should we buffer samples, or requests?

* should the samples/requests be stored in a flat array instead of a 
linked list? Based on usage patterns it seems that'd be easier and more 
efficient.