Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1489 X-link: https://github.com/facebook/react-native/pull/41690 Centering involves centering the margin box in the content box of the parent, and then getting the distance from the flex start edge of the parent to the child Reviewed By: NickGerleman Differential Revision: D51383625 fbshipit-source-id: 6bbbace95689ef39c35303bea4b99505952df457