Kevin Gozali 34b8876ac6 iOS: Introduced RCTSurfaceHostingProxyRootView for migration to RCTSurfaceHostingView
Summary:
To help with migration from direct usages of RCTRootView to RCTSurfaceHostingView, RCTSurfaceHostingProxyRootView is added, which is simply a custom impl of RCTSurfaceHostingView, but will all RCTRootView APIs preserved. This makes it easy to do a drop-in replacement in native callsites:

```
// before:
RCTRootView *rootView = [[RCTRootView alloc] init...];

// after:
RCTRootView *rootView = (RCTRootView *)[[RCTSurfaceHostingProxyRootView alloc] init...];
```

Reviewed By: shergin

Differential Revision: D7141696

fbshipit-source-id: db8c447749eaa896efaa37774a9babef132128eb
2018-03-02 19:44:18 -08:00
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