tree 1aa7ae3706bd0d2945d9453cb5935f7c69468139
parent 380991805fcf17eaefaa811b961702053190f4fa
author Ali Ghassemi <aghassemi@google.com> 1452192628 -0800
committer Ali Ghassemi <aghassemi@google.com> 1452192782 -0800

SyncSlides: Only support one live presentation at a time.

Presenting multiple decks at the same time is not a use-case
that we need to support.

Starting a new presentation will stop the previous
presentation, if any.

Change-Id: I27b58f8ba91abd11510a5a3554c2a493561e42d8