Summary: public UIImplementationProvider allows plugging in an alternative UIImplementation. A follow up diff adds a toggle under FB Dev Settings and uses this class to control an implementation. This allows us experimenting with other ways of generating UI hierarchy from JavaScript components.
Reviewed By: astreet
Differential Revision: D2554774
fb-gh-sync-id: 6574a893020e3519bd2ab00b9620a6dbdfaed595