Summary: It seems like `nativePerformanceNow` might not be getting installed in time to be used by InitializeCore on Android. Using PerformanceLogger.currentTimestamp instead, which uses nativeQPLTimestamp (which is what we should be using anyway)
Reviewed By: alexeylang
Differential Revision: D12875187
fbshipit-source-id: 6eda5d2ed7948ba48c63f76b40b2014511c32494