Summary:
Fixes issue brought up in https://github.com/facebook/react-native/issues/10603
The gist of the problem is that in css it is fine for a child to overflow a parent if it feels the need to, we were not respecting this.
Reviewed By: mmmulani
Differential Revision: D4182141
fbshipit-source-id: c73fd15d2577ab846fc8a202d529d0e6e1207b75