Summary: public
Instead of using 0 as a default we should use UNDEFINED values. That is because setting 0 for left border in case when the property was deleted will interfere with horizontal border (or margin) value. Setting UNDEFINED makes CSSLayout nodes behave correctly in that case.
Reviewed By: andreicoman11
Differential Revision: D2668669
fb-gh-sync-id: 61ce62081583fc39864268333ac8c1409c276cad