Summary:
`rootTag` is a lie, it's passed around but never actually used. IIRC
`findInstanceByNativeTag` needed it but seems like not anymore.
Reviewed By: spicyj
Differential Revision: D3382144
fbshipit-source-id: eb96870a3848333e66bf045e78e95c7763812cc4
Summary:
`renderApplication` is cluttered with unrelated Dev-only stuff
with duplicate code across iOS and Android. This is the first
diff in series of refactorings, with the end goal of making element
inspector work on Modals.
Reviewed By: spicyj
Differential Revision: D3381956
fbshipit-source-id: 4ac6525633e7482628d2b064eb894da2806daf8c