Add point at beginning of InitializeCore
Add point at beginning of InitializeCore

Summary: Also add an optional timestamp param to PerformanceLogger.markPoint() so you can backdate a point

Reviewed By: alexeylang

Differential Revision: D10149337

fbshipit-source-id: 6cc5f95b34b3293589e7cb41b99cee17bf128163

janicduplessis/react-native,javache/react-native,exponent/react-native,hammerandchisel/react-native,javache/react-native,facebook/react-native,exponent/react-native,myntra/react-native,myntra/react-native,exponentjs/react-native,facebook/react-native,exponentjs/react-native,arthuralee/react-native,hammerandchisel/react-native,janicduplessis/react-native,javache/react-native,exponent/react-native,hammerandchisel/react-native,exponentjs/react-native,pandiaraj44/react-native,janicduplessis/react-native,hoangpham95/react-native,hoangpham95/react-native,hammerandchisel/react-native,pandiaraj44/react-native,hoangpham95/react-native,exponent/react-native,janicduplessis/react-native,facebook/react-native,exponent/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,janicduplessis/react-native,javache/react-native,pandiaraj44/react-native,exponentjs/react-native,arthuralee/react-native,myntra/react-native,hoangpham95/react-native,myntra/react-native,janicduplessis/react-native,arthuralee/react-native,arthuralee/react-native,hoangpham95/react-native,facebook/react-native,pandiaraj44/react-native,hammerandchisel/react-native,hammerandchisel/react-native,javache/react-native,exponentjs/react-native,exponentjs/react-native,janicduplessis/react-native,exponent/react-native,javache/react-native,hoangpham95/react-native,exponent/react-native,exponent/react-native,pandiaraj44/react-native,pandiaraj44/react-native,hoangpham95/react-native,javache/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,hammerandchisel/react-native,facebook/react-native,exponentjs/react-native,facebook/react-native,pandiaraj44/react-native,myntra/react-native,hoangpham95/react-native,janicduplessis/react-native,hammerandchisel/react-native,javache/react-native,myntra/react-native,exponentjs/react-native,myntra/react-native,facebook/react-native,myntra/react-native