Yes, Galene 0.4 and later uses SVC by default when the following conditions are satisfied:
* the sender is using a Chromium-like browser (the receiver may be Chromium, Firefox or Safari);
* the codec is either VP8 or VP9;
* there are at least three users in the group.
[0] https://github.com/jech/galene
[1] https://github.com/pion/rtp/blob/master/codecs/vp9_packet.go