Using StatsLog for notifyingAppPredictor

> Adding a listener in StartsLogManager for listening to events.
  This allows events to be directored to the predictor only if
  it is already running, instead of creating it.
> Unifying the event format to be same as hotseat predictor

Bug: 160748731
Change-Id: Ib00e6249ff642c030f00bcad5b748255e704d16a
24 files changed