Refactor ReactBridgeStartupData to work with QPL and remove unused fields
Refactor ReactBridgeStartupData to work with QPL and remove unused fields

Summary:
This class contains metrics about RN bridge startup that was being sent via FBAnalytics.

This diff refactors out any timespans being collected into a separate method. This refactor is NOT ENOUGH to format the data into a format QPL accepts. I still need to refactor these timespans into _start and _end points for QPL points to work correctly. This diff is a starting point.

Reviewed By: ejanzer

Differential Revision: D10466982

fbshipit-source-id: 4bc1159c4e53328f2252a8c606c8d6ff8d657489

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