Summary:
Adds a kill switch that reverts the default behavior of `overflow` to be hidden again. The intent of this kill switch is to give applications more time to migrate if necessary (e.g. if they are depending on third party packages with native components that are not compatible with `overflow` being visible by default).
To use the flag, simply set:
import com.facebook.react.views.view.ReactViewGroup;
// Somewhere in the initialization of your application.
ReactViewGroup.sDefaultOverflowHidden = true;
Reviewed By: achen1
Differential Revision: D8718963
fbshipit-source-id: 0eb9aee45dfe04e9ae34d86e3bedcd30a185ef82