Summary:
Changes where we delegate to the launcher to a later point so we can successfully intercept file open events and custom URI events.
There's more information in Phase 1 in this paragraph of the doc: https://fb.quip.com/tpqnAbxnJw1w#UNZACAnVVGs
Reviewed By: danielbuechele
Differential Revision: D14563585
fbshipit-source-id: a8757a6072386e56102f15b0668456369a44aad7
