Bug 1100904 - Add TransitionsTracker API (r=mcomella)
Bug 1100904 - Track transitions in tab strip (r=mcomella)
Bug 1100904 - Ensure panel updates don't happen during transitions (r=margaret)
Bug 1100904 - Don't block panel loading in HomeLoader.load() (r=margaret)
Bug 1100904 - Track about:home strip bouncy animation (r=liuche)