Summary:
I've left InteractionTracker without a store, so it doesn't know the sessionId. It really should have one, but that will have to be a different change.
We don't actually use the InteractionTracker at the moment so it's not a major deal for now.
The idea is to be able to get data like what percentage of sessions encounter an error, and how many errors sessions usually have etc.
Reviewed By: passy
Differential Revision: D13624031
fbshipit-source-id: 664e7ac5023166c2f72df3058c219901be7ff77a
005383f94b