Summary: The original flex colum that came as standard did not flex to fill the remainder of the screen. Adding this component allows for a full screen flex column so that the scroll bar in the timeline looks correct.
Reviewed By: jknoxville
Differential Revision: D16416933
fbshipit-source-id: bd296aea85730f192778ed0aca4b226893b2829d
f313d5edcb