Summary:
Due to an earlier commit, we now have to use the full path for requiring `performanceNow`.
**Test plan (required)**
Verified that the IncrementalExample works when adding it to UIExplorer.
Closes https://github.com/facebook/react-native/pull/9595
Differential Revision: D3775101
Pulled By: javache
fbshipit-source-id: 6252ce8c872896f4cfdb9a31bdbc79d6aaf4684d
Adam ComellaandFacebook Github Bot 5
b01feb41d8