Summary: This way `UIImplementation` can hold on to it and use it outside of calls from the `UIManagerModule`.
Reviewed By: lexs
Differential Revision: D3899774
fbshipit-source-id: 01e4956c4540bcdf30774a3f40a625e934714ee9
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