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