Add sharding_supervisor to DEPS to prepare for swarm/isolated testing.

This component is now needed in addition to the swarm_client.

BUG=1916
TEST=I've run bots with this locally synced.
R=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2314004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4863 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed