Summary: - CSSLayoutSetLogger - Problem: Unity or other logging system can't use printf output - Solution: Add CSSLogger to pass CSSNodePrint result to UnityEngine.Debug.Log or other logging system via CSSLogger function for debugging purpose Reviewed By: emilsjolander Differential Revision: D4027044 fbshipit-source-id: 90e2e449260888770f71fa7ea790ca9764d91c44