update JSTime to last call
update JSTime to last call

Summary: ChangeLog: [General] [Added] - support PerformanceLogger stopTimespan updates

Reviewed By: alexeylang

Differential Revision: D20095949

fbshipit-source-id: 3522a8d16ced44d6b699b294004371e223f9f619

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